Why Does My Knee Hurt Going Down Stairs but Not Walking?

Why Does My Knee Hurt Going Down Stairs but Not Walking? A Physical Therapist Answers

By Nova Physical Therapy | North Hollywood, CA

Looking for physical therapy in North Hollywood? Explore Nova Physical Therapy Services.

You can walk through the grocery store.

No major problem.

You can stand at work.

You may even be able to exercise.

Then you reach a flight of stairs.

Going up isn't too bad.

But going down?

Your knee starts hurting.

Maybe the pain is around the kneecap.

Maybe it feels like it's underneath it.

Maybe you notice:

“My knee hurts every time I go downstairs.”

“Walking on flat ground is fine.”

“Going down is worse than going up.”

“Squatting bothers it too.”

“My knee clicks on the stairs.”

“I don't understand why stairs hurt when normal walking doesn't.”

This pattern can occur with several musculoskeletal knee presentations, including patellofemoral pain.

But there is an important distinction:

Knee pain on stairs does not automatically mean you have patellofemoral pain—or that something is damaged behind your kneecap.

Meniscal conditions, osteoarthritis, tendon-related problems, traumatic injuries, referred symptoms, and other conditions can also affect stair tolerance.

So rather than diagnosing the knee from one activity, the physical therapy evaluation asks:

Why is this particular task difficult for this particular person?

Patient Question

“My knee doesn't bother me much when I walk on flat ground, but going downstairs hurts—especially around the front of my knee. Why does going down stairs hurt more than walking, and can physical therapy help?”

The Short Answer

Going downstairs places different demands on your knee than walking on level ground.

Your muscles must control your body as you lower yourself from one step to the next.

That requires coordinated contribution from the:

quadriceps

hip muscles

ankle

knee

and the rest of the lower extremity.

One common musculoskeletal presentation associated with pain during stairs, squatting, running, jumping, and prolonged sitting is patellofemoral pain. APTA's current clinical summary describes patellofemoral pain as anterior, retropatellar, or peripatellar knee pain that can be provoked by activities such as stair negotiation and squatting. APTA

But:

“My knee hurts going downstairs” is a symptom pattern—not a diagnosis.

Physical therapy may help when the presentation is appropriate for rehabilitation.

Current evidence supports exercise-based management for patellofemoral pain, although the exact program should be individualized. A 2025 systematic review found strengthening exercise effective for reducing pain and improving function, while the broader 2026 evidence base shows therapeutic exercise remains the dominant intervention studied for this condition. PubMed

Key Takeaways

1. Going downstairs is mechanically different from walking on level ground.

Your lower extremity must control your body while you descend.

2. Pain around the kneecap during stairs can occur with patellofemoral pain.

But stair pain alone cannot establish that diagnosis. APTA

3. Your kneecap does not necessarily need to be “put back into place.”

Patellofemoral pain is more complex than simply assuming the patella is tracking incorrectly.

4. Hip and knee strengthening may both be relevant.

Exercise programs are commonly used in evidence-based rehabilitation for patellofemoral pain. APTA

5. The goal isn't simply to avoid stairs.

If stairs are part of your home, work, or daily life, rehabilitation should ultimately help prepare you for that demand.

Why Does Going Downstairs Put More Demand on My Knee?

Think about stepping off a curb.

You don't simply fall onto the lower leg.

Your body has to control the descent.

Now repeat that movement:

10 times

20 times

an entire flight of stairs.

During stair descent, the muscles around the lower extremity work to control how quickly your body lowers.

The quadriceps play an important role in controlling knee movement.

That is one reason someone may comfortably walk across a flat parking lot but experience symptoms descending stairs.

The task is different.

Why Does Going Down Hurt More Than Going Up?

Patients ask this frequently.

Going upstairs requires you to generate enough force to raise your body.

Going downstairs requires controlled lowering.

For some people with knee symptoms, that lowering phase is particularly provocative.

This does not necessarily mean:

“Going down is damaging your knee.”

It tells us that stair descent currently exceeds—or challenges—the knee's comfortable capacity.

That's useful rehabilitation information.

What Is Patellofemoral Pain?

The patellofemoral joint is where the:

patella — kneecap

meets the:

femur — thigh bone.

Patellofemoral pain typically refers to pain around or behind the kneecap associated with activities that load the patellofemoral region.

APTA's clinical summary describes common aggravating activities including:

squatting

stairs

running

jumping

and

prolonged sitting. APTA

Patients may describe:

pain around the kneecap

pain underneath the kneecap

pain going downstairs

pain during squats

or

pain after sitting for a long time.

But these symptoms still need to be evaluated in context.

Is Patellofemoral Pain the Same as “Runner's Knee”?

The term runner's knee is commonly used to describe patellofemoral pain.

But the condition is certainly not limited to runners.

It can affect:

runners

hikers

gym-goers

athletes

workers

and people who do not participate in sports at all.

A patient does not need to run to develop pain around the kneecap.

Does Knee Pain on Stairs Mean My Cartilage Is Wearing Away?

Not automatically.

This is an important fear to address.

A patient may feel pain behind the kneecap and immediately think:

“The cartilage must be gone.”

Pain cannot tell us exactly what a structure looks like.

Symptoms and structural imaging findings do not always correspond one-to-one.

Likewise, experiencing pain while descending stairs does not prove that each step is creating additional structural damage.

If imaging or medical assessment is clinically indicated, that decision should be based on the overall presentation rather than fear generated by a single symptom.

Is My Kneecap Tracking Incorrectly?

Patients are often told:

“Your kneecap isn't tracking correctly.”

That explanation can make someone afraid to bend the knee.

Human movement naturally varies from person to person.

Patellofemoral pain is generally considered multifactorial rather than reducible to one universal kneecap-tracking abnormality.

A physical therapist may assess:

knee movement

hip movement

strength

mobility

task mechanics

and

symptom behavior.

But the purpose is not to convince every patient that their kneecap is moving incorrectly.

Why Does My Knee Hurt When I Squat Too?

Squatting and stair descent have something important in common:

Both require the knee to tolerate load while bending.

That's why someone may report:

“Walking doesn't hurt, but squatting and stairs do.”

Again, this does not automatically identify one injured structure.

It tells us:

bent-knee loading appears to be an important part of the symptom pattern.

That information can guide both examination and exercise progression.

Why Does My Knee Hurt After Sitting for a Long Time?

Some people with patellofemoral pain report discomfort after prolonged sitting.

You may notice this:

at a movie

during a long drive

on an airplane

at your desk

or

after sitting through a meeting.

You stand up and think:

“Why does my knee hurt? I wasn't even doing anything.”

Symptoms can be position- and load-sensitive.

That does not mean sitting damaged the knee.

Changing position and gradually improving tolerance may be part of the management strategy.

Why Does My Knee Click or Crack on Stairs?

Knees make noise.

A lot.

Patients describe:

clicking

cracking

popping

grinding

or

crunching.

The medical term often used for joint noise is crepitus.

Noise by itself does not automatically indicate injury.

A painless noisy knee is very different from:

a traumatic pop followed by swelling and inability to bear weight.

Likewise, knee noise plus pain should be evaluated within the entire clinical picture rather than interpreted as:

“My knee is grinding itself away.”

Why Does Only One Knee Hurt?

Human beings are not perfectly symmetrical.

One side may have different:

strength

mobility

previous injuries

activity history

movement strategies

or

current loading.

That doesn't mean every asymmetry needs to be corrected.

The relevant question is whether an identified difference appears meaningful to the patient's symptoms and function.

Is My Quadriceps Weak?

Possibly.

The quadriceps are important for controlling knee movement, particularly during tasks such as:

stairs

squats

sit-to-stand

and

step-down activities.

A physical therapist may therefore assess quadriceps muscle performance.

But:

knee pain itself can affect strength testing.

If producing force hurts, a patient may generate less force.

So a weak painful test doesn't automatically mean:

“Weak quads caused your knee pain.”

The relationship can be more complicated.

Can Weak Hips Cause Knee Pain?

Hip muscle performance can be relevant in some people with patellofemoral pain.

But saying:

“Your glutes are weak, therefore your knee hurts”

is usually too simplistic.

Research has supported proximal or hip-focused exercise as part of patellofemoral rehabilitation, and APTA's evidence-based guideline includes combined hip- and knee-targeted exercise approaches. APTA

However, that does not mean every patient needs exactly the same hip exercises.

The exercise program should match the examination and functional goals.

Does My Knee Go Inward Too Much?

You may have seen videos online showing a person's knee moving inward during:

squats

running

or

step-downs

with a large red X over the movement.

Movement patterns can sometimes be clinically relevant.

But they should not automatically be labeled:

dangerous

or

damaging.

A therapist may assess movement to understand how the entire lower extremity manages a task.

If changing a movement strategy improves symptoms or performance, it may become part of rehabilitation.

But the goal is not to make every person's movement look identical.

Should I Stop Using Stairs?

Not necessarily.

Suppose you live in a second-floor apartment.

“Never use stairs” isn't a particularly practical rehabilitation plan.

During an irritable stage, stair frequency or technique may temporarily need modification.

But if stair negotiation is part of daily life, rehabilitation should generally work toward restoring stair tolerance when appropriate.

The progression might look something like:

lower-demand strengthening

→

controlled squatting

→

step-ups

→

controlled step-downs

→

greater stair volume

depending on the individual.

The exact progression should be individualized.

Should I Use the Handrail?

If the handrail makes stair negotiation safer or more comfortable, using it can be reasonable.

Using support temporarily does not mean:

“My knee is failing.”

It may simply reduce demand while capacity is being rebuilt.

As strength and tolerance improve, the amount of support can be reassessed.

Should I Take One Step at a Time?

Sometimes temporarily.

If alternating steps causes substantial symptoms, modifying stair technique can help manage the current demand.

But again:

temporary modification is not necessarily the final goal.

If reciprocal stair climbing is important to the patient, rehabilitation can progressively work toward it when appropriate.

Should I Wear a Knee Brace?

A brace is not automatically necessary for patellofemoral pain.

Some people may find certain external supports helpful.

Others may not.

The APTA patellofemoral pain guideline evaluates several adjunctive interventions, but exercise remains a central component of evidence-based management. APTA

A brace should therefore not automatically replace appropriate evaluation and rehabilitation.

What About Knee Taping?

Patellar taping may be used in selected patients as part of a broader rehabilitation strategy.

But tape does not:

restore quadriceps capacity

restore hip strength

or

progressively prepare someone for stairs.

Think of taping, when appropriate, as a potential adjunct rather than the entire rehabilitation program.

Do I Need an MRI?

Not every person with knee pain needs an MRI.

Imaging decisions depend on the history, examination, trauma, suspected pathology, symptom progression, and other clinical considerations.

A person with gradual anterior knee pain during stairs and squatting may have a very different presentation from someone who:

twisted the knee

heard a pop

developed rapid swelling

and

cannot bear weight.

The evaluation helps determine whether additional medical assessment or imaging may be appropriate.

Should I Strengthen My Knee?

For appropriately evaluated patellofemoral pain, strengthening exercise is an important conservative treatment option.

A 2025 systematic review and meta-analysis examined strengthening compared with other conservative treatments and found evidence supporting strengthening for reducing pain and improving functional ability in patellofemoral pain. PubMed

APTA's clinical practice guideline likewise provides evidence-based recommendations for patellofemoral pain rehabilitation. APTA

But:

“strengthen your knee”

isn't a complete program.

The therapist still needs to determine:

what to strengthen

how much resistance

which range

how many repetitions

how frequently

and

how to progress toward stairs.

Are Squats Bad for Knee Pain?

Not automatically.

Squatting is a normal human movement.

We squat to:

sit

stand

pick things up

exercise

and perform countless daily tasks.

If deeper squatting is currently provocative, the exercise may initially be modified.

For example, rehabilitation may use:

a smaller range

external support

different resistance

or

different volume.

Then the demand may be progressively increased.

The goal is usually not:

“Never bend your knee.”

It is:

improve how much knee-bending load you can comfortably tolerate.

Are Step-Down Exercises Good for Knee Pain?

They can be useful for some patients because they resemble the exact task that causes difficulty.

But a painful stair does not mean you should immediately perform:

100 painful step-downs.

A therapist may first address strength and tolerance at a lower level.

Then progressively introduce:

small step-downs

greater height

additional repetitions

external resistance

or

greater speed

depending on the person's goals.

This is the difference between:

doing an exercise

and

progressing rehabilitation.

Should Exercise Hurt?

The answer should be individualized.

Two common extremes are:

“Any pain means stop immediately.”

and

“No pain, no gain.”

Neither statement captures the complexity of rehabilitation.

A physical therapist may consider:

pain during exercise

symptoms afterward

next-day response

swelling

movement quality

functional improvement

and

overall progression.

Exercise dosage can then be adjusted.

Can Physical Therapy Help?

For an appropriately evaluated musculoskeletal knee presentation, physical therapy may help improve:

• Knee muscle performance
• Hip muscle performance
• Lower-extremity strength
• Functional tolerance
• Squatting
• Sit-to-stand
• Step-ups
• Step-downs
• Stair negotiation
• Walking
• Running
• Jumping
• Balance
• Work tolerance
• Exercise tolerance
• Return to recreation or sport

APTA's patellofemoral pain clinical practice guideline provides evidence-based treatment recommendations for this population, including exercise-focused interventions. APTA

But the goal isn't:

“Make the knee pass a strength test.”

The goal may be:

“Walk downstairs normally.”

“Use the stairs at work.”

“Squat at the gym.”

“Return to hiking.”

“Run again.”

or

“Play with my children without worrying about my knee.”

Those functional goals should help shape the rehabilitation program.

What Does Research Say?

2026 JOSPT Evidence Map

A 2026 Journal of Orthopaedic & Sports Physical Therapy systematic evidence and gap map examined the treatment literature for patellofemoral pain.

Researchers identified:

307 studies.

Physical interventions dominated the literature, and therapeutic exercise appeared in 281 studies—82% of the included evidence base.

Pain was measured in 89% of studies and physical function in 70%.

However, the authors also identified important limitations:

67% of the studies were considered at high risk of bias, and relatively few adequately addressed outcomes such as quality of life, sleep, and psychological factors. PubMed

That's an important research message.

There is a lot of patellofemoral pain research.

But:

more research does not automatically mean every clinical question has a certain answer.

2025 Strengthening Systematic Review

A 2025 systematic review and meta-analysis examined strengthening exercise compared with other conservative treatments for patellofemoral pain.

The review included randomized controlled trials involving adolescents over 16 and adults through age 44 with diagnosed patellofemoral pain.

The authors evaluated whether strengthening could reduce pain and improve functional ability. PubMed

This supports the role of exercise while reinforcing an important limitation:

Research performed in a particular population should not automatically be generalized to:

every age

every knee condition

or

every person experiencing stair pain.

APTA Clinical Practice Guideline

The American Physical Therapy Association patellofemoral pain guideline provides evidence-based treatment recommendations for people with patellofemoral pain.

APTA also maintains a clinical summary updated in 2024 describing patellofemoral pain as a common musculoskeletal condition associated with anterior, retropatellar, or peripatellar knee pain and functional problems during activities such as squatting and stair negotiation. APTA

The guideline supports individualized classification and evidence-based intervention rather than treating every person with anterior knee pain identically.

What Does This Mean for Patients?

Current evidence does not support reducing knee rehabilitation to:

“Your kneecap is out of place.”

or

“Your quads are weak.”

or

“Your glutes aren't firing.”

or

“Never squat again.”

A more useful process is:

evaluate → understand the aggravating task → identify meaningful impairments → appropriately manage current load → progressively strengthen → practice the task → rebuild capacity.

If the patient's problem is:

going downstairs,

then successful rehabilitation should eventually consider:

going downstairs.

What Happens During a Physical Therapy Evaluation?

At Nova Physical Therapy, an evaluation for knee pain with stairs may include, when appropriate:

• Detailed symptom history
• Knee range of motion
• Knee muscle-performance testing
• Hip muscle-performance testing
• Lower-extremity mobility
• Relevant palpation
• Walking assessment
• Sit-to-stand
• Squatting
• Step-up
• Step-down
• Stair negotiation
• Single-leg activities
• Balance
• Running or jumping when appropriate
• Work- or sport-specific movements
• Screening for findings requiring additional medical evaluation

But some of the most useful information comes from simple questions.

We may ask:

Where exactly does it hurt?

Does going up hurt?

Does going down hurt more?

How many stairs before symptoms begin?

Does squatting hurt?

Does prolonged sitting bother you?

Is there swelling?

Did you twist the knee?

Was there a fall?

Does it lock?

Does it give way?

Do you run?

Do you hike?

What happens during exercise?

What are you trying to return to?

Those answers help determine whether the presentation is appropriate for physical therapy and what rehabilitation should target.

California's PTBC states that licensed physical therapists evaluate a patient's physical status, establish a plan of care and goals, and provide interventions aimed at improving movement and function. Physical Therapy Board of California

Nova's educational content therefore stays focused on physical therapy examination, impairments, movement, function, rehabilitation, patient education, and appropriate referral rather than diagnosing a medical condition from symptoms alone. Physical Therapy Board of California

When Should You Seek Medical Attention?

Gradually developing knee discomfort on stairs is different from:

“I twisted my knee, heard a pop, and it immediately swelled.”

Seek prompt medical evaluation for symptoms such as:

• Significant trauma
• Inability to bear weight
• Obvious deformity
• Rapid or substantial swelling following an injury
• A locked knee that cannot normally bend or straighten
• Sudden major loss of function
• Progressive neurological weakness or numbness
• Significant redness or warmth accompanied by fever or systemic illness
• Unexplained rapidly worsening symptoms
• Calf swelling, pain, or other symptoms concerning for a vascular problem

A knee that repeatedly gives way or develops persistent mechanical locking also deserves appropriate assessment.

When symptoms do not fit a straightforward musculoskeletal presentation, referral may be appropriate.

Why Patients Choose Nova Physical Therapy

At Nova Physical Therapy, our philosophy is simple:

We Care.

But:

“My knee hurts”

doesn't tell us enough.

One patient means:

“My knee hurts only on the last five stairs going downstairs.”

Another means:

“I can use stairs, but I can't squat at the gym.”

Another:

“I can walk around North Hollywood without pain, but hiking downhill bothers me.”

Another:

“My knee hurts after sitting at my desk for an hour.”

And another:

“I twisted my knee yesterday, heard a pop, and now it's swollen.”

Those five patients should not automatically receive the same treatment.

So we want to understand:

What activity causes your symptoms?

What does the knee tolerate comfortably?

How strong is the lower extremity?

How does the knee respond to squatting and stepping?

What does the physical therapy examination show?

Are there findings requiring referral?

What do you actually need to get back to?

Then, when physical therapy is appropriate, rehabilitation can be built around the individual.

Our approach emphasizes:

individualized physical therapy evaluation

evidence-informed rehabilitation

progressive strengthening

functional movement

appropriate load management

patient education

return to daily activity, exercise, and sport

and

appropriate referral when findings warrant additional medical evaluation.

The goal isn't simply:

“Make your knee hurt less while you're lying on a treatment table.”

The goal is to help build the capacity you need when you:

walk

stand

squat

climb stairs

go downstairs

hike

run

work

or

play your sport.

That's part of what We Care means to us.

Frequently Asked Questions

Why does my knee hurt going downstairs?

Stair descent places different demands on the knee and surrounding muscles than level walking. Patellofemoral pain is one possible presentation associated with stair pain, but symptoms alone cannot establish the diagnosis. APTA

Why does my knee hurt going down stairs but not up?

Ascending and descending stairs involve different muscular and mechanical demands. Some knee presentations are more sensitive to the controlled lowering required during descent.

Why can I walk normally but stairs hurt?

Level walking and stair negotiation place different demands on the lower extremity. Your current capacity may be adequate for walking but insufficient or sensitive during higher-demand bent-knee tasks.

Does stair pain mean my knee cartilage is damaged?

No. Pain during stairs alone cannot determine the condition of your cartilage or identify a specific injured structure.

Is knee pain on stairs patellofemoral pain?

It can occur with patellofemoral pain, but other conditions can produce similar symptoms. An appropriate clinical evaluation is necessary. APTA

Does clicking on stairs mean my knee is damaged?

Not necessarily. Joint noises are common. Noise should be interpreted together with pain, swelling, trauma, mechanical symptoms, and function.

Should I stop using stairs?

Not automatically. Temporary activity modification may sometimes help, but if stairs are part of daily life, rehabilitation may eventually work toward improving stair tolerance.

Are squats bad for patellofemoral pain?

Not automatically. Squats can be modified and progressively loaded according to symptoms and current capacity.

Should I strengthen my quadriceps?

Quadriceps strengthening may be relevant for some patients with patellofemoral pain, but the program should be individualized.

Should I strengthen my hips for knee pain?

Hip-targeted exercise can be useful as part of some patellofemoral pain rehabilitation programs, often in combination with knee-focused exercise. APTA

Do I need an MRI for knee pain on stairs?

Not automatically. Imaging decisions depend on the complete clinical presentation, including history, examination, trauma, mechanical symptoms, and progression.

Can physical therapy help knee pain going downstairs?

For an appropriately evaluated musculoskeletal knee presentation, physical therapy may address strength, mobility, movement tolerance, stair mechanics, and functional capacity. Exercise is strongly represented in the patellofemoral pain evidence base. PubMed

Schedule an Evaluation

If knee pain is making it difficult to:

• Go downstairs
• Climb stairs
• Squat
• Sit for prolonged periods
• Get out of a chair
• Walk
• Hike
• Run
• Exercise
• Work
• Play sports
• Perform everyday activities

Nova Physical Therapy can evaluate your movement, muscle performance, and functional limitations and determine whether physical therapy is appropriate.

Our rehabilitation approach focuses on:

movement + progressive strength + functional capacity + education + appropriate load progression + return to meaningful activity.

Ready to learn more? Visit Nova Physical Therapy Services to explore our services and learn more about physical therapy care in North Hollywood.

Disclaimer

This article is for general educational and informational purposes only. It does not constitute medical advice, medical diagnosis, imaging interpretation, exercise clearance, or individualized physical therapy treatment.

Knee pain while descending stairs, anterior knee pain, clicking, pain during squatting, pain after prolonged sitting, weakness, or other symptoms cannot independently establish patellofemoral pain, cartilage injury, meniscal pathology, osteoarthritis, tendon pathology, ligament injury, or another musculoskeletal or medical condition.

Physical therapists evaluate physical status, movement, muscle performance, function, and activity limitations within their regulated scope of practice and refer when findings warrant additional medical assessment. The Physical Therapy Board of California regulates physical therapy practice through the state's Physical Therapy Practice Act. Physical Therapy Board of California

Research involving people diagnosed with patellofemoral pain should not automatically be generalized to acute traumatic injuries, fractures, ligament tears, meniscal injuries, postoperative knees, inflammatory disorders, or other causes of knee symptoms.

Exercise, strengthening, taping, bracing, manual therapy, activity modification, or other interventions cannot guarantee symptom resolution or prevention of recurrence.

Seek appropriate medical care for significant trauma, inability to bear weight, major swelling after injury, deformity, persistent locking, fever with a red or hot joint, rapidly progressive symptoms, significant neurological changes, or other concerning findings.

Individual results vary.

References

1. Bridging Gaps in Delivering High-Value Treatment for Patellofemoral Pain: A Systematic Evidence and Gap Map of Interventions for Patellofemoral Pain. Journal of Orthopaedic & Sports Physical Therapy.2026;56(2):98–108. The review identified 307 studies; therapeutic exercise was included in 281 studies. PubMed
2. Conservative treatment of patellofemoral pain: effectiveness of strength exercises compared to other treatments—a systematic review with meta-analysis. Published 2025. The review evaluated strengthening exercise for pain and functional outcomes in patellofemoral pain. PubMed
3. Willy RW, Hoglund LT, Barton CJ, et al. Patellofemoral Pain: Clinical Practice Guidelines. Academy of Orthopaedic Physical Therapy of the American Physical Therapy Association. The guideline provides evidence-based recommendations for physical therapy management of patellofemoral pain. APTA
4. American Physical Therapy Association. Patellofemoral Pain Clinical Summary. Updated May 2, 2024. The summary describes common presentations including anterior, retropatellar, or peripatellar pain associated with activities such as squatting, stair negotiation, running, jumping, and prolonged sitting. APTA
5. Proximal exercises are effective in treating patellofemoral pain syndrome: a systematic review. The review found hip/proximal exercise programs associated with improvements in pain and function. PubMed
6. Physical Therapy Board of California — Physical Therapy Practice Act. California laws governing the practice of physical therapy.
7. Physical Therapy Board of California — Consumer Information. PTBC describes physical therapists as licensed professionals who evaluate physical status, establish plans of care and goals, and provide interventions to improve movement and function.