BlogOct 18, 2026

Why Does the Base of My Thumb Hurt When I Open Jars or Turn Keys? A Physical Therapist Answers

By Nova Physical Therapy | North Hollywood, CA

October 18, 2026

Patient Question

“I feel an aching or sharp pain right at the base of my thumb when I open a jar, turn a key, twist a doorknob, or hold my phone. Sometimes my grip feels weak. Is this arthritis, a tendon problem, or something that physical therapy can help?”

The Short Answer

Pain where the thumb meets the wrist can come from several structures. One common possibility—especially when gripping and pinching become uncomfortable—is thumb carpometacarpal (CMC) joint osteoarthritis, sometimes called basal thumb arthritis. Other possibilities include tendon irritation, ligament injury, or a problem involving a nearby joint or nerve. The location of pain alone cannot confirm a diagnosis. A physical therapist can assess movement, strength, task tolerance, and functional limitations, and can coordinate medical referral when the findings suggest a condition that needs further evaluation.

When thumb-base osteoarthritis is diagnosed, conservative management often includes education, adjustments to painful tasks, appropriately progressed hand exercises, and sometimes a supportive thumb orthosis. A 2026 randomized trial and recent evidence reviews suggest that exercise and self-management can be useful, but no single program works equally well for everyone. The goal is to make everyday hand use more comfortable and functional—not to promise reversal of arthritis.

Where Is the Thumb CMC Joint, and Why Does It Matter?

The thumb carpometacarpal joint is located near the fleshy base of the thumb, where the first metacarpal meets a small wrist bone called the trapezium. Its shape gives the thumb a wide range of motion, allowing you to oppose your thumb to your fingertips, grip a steering wheel, turn a key, and hold small objects. Those same tasks can place substantial forces across the joint.

When the joint becomes irritated or affected by osteoarthritis, pinching and twisting may be uncomfortable. Some people notice stiffness after rest, aching with repeated use, a reduced ability to grasp firmly, or a visible change in the contour at the thumb base. Others have changes on imaging but little pain. Symptoms and function matter more than an X-ray finding by itself.

Why Do Opening Jars and Turning Keys Trigger Thumb Pain?

Opening a jar combines strong grip, thumb pinch, and rotational force. Turning a key or twisting a doorknob may require a smaller movement but still loads the thumb base. If the joint is sensitive, nearby muscles are not coordinating comfortably, or a tendon is irritated, these activities can reproduce pain. Repeatedly forcing through sharp pain may make a flare harder to settle.

Pain with these activities does not necessarily mean the joint is being damaged each time it moves. The useful questions are how much load the hand can currently tolerate, which movement patterns aggravate symptoms, and whether changing technique or gradually improving strength makes the task easier.

Is It Thumb Arthritis, De Quervain’s, or Something Else?

Thumb-base pain is not one diagnosis. Thumb CMC osteoarthritis often causes discomfort around the base of the thumb with pinching, gripping, or twisting. De Quervain tenosynovitis more commonly involves pain along the thumb-side of the wrist, especially during certain thumb and wrist movements. A sprain may follow a fall or forceful pull, while numbness or tingling can point toward a nerve-related problem. Trigger thumb can cause catching or locking during bending.

These patterns overlap, and more than one issue can occur at the same time. A clinician may examine the location of tenderness, joint motion, tendon loading, strength, sensation, and history of injury. Medical assessment or imaging may be appropriate when the presentation is unclear, traumatic, severe, or not improving.

Who Commonly Develops Thumb-Base Pain?

Thumb CMC osteoarthritis becomes more common with age and is seen frequently in women, but symptoms can occur in people of different ages and backgrounds. A history of joint injury, certain joint characteristics, and repetitive hand demands may influence symptoms. However, it is not accurate to say that texting, typing, or opening jars alone causes arthritis. A person can also have painful thumb tendons or ligaments without osteoarthritis.

For people in North Hollywood, Burbank, Toluca Lake, Studio City, and Valley Village, the functional problems may look familiar: discomfort using car keys, handling tools, cooking, working at a computer, caring for children, or lifting household items. Treatment should be guided by the specific activities a person wants to regain.

What Can I Change at Home to Reduce Thumb Pain?

Small changes in how you handle everyday objects can sometimes reduce symptom irritation while preserving normal activity. The aim is to modify excessive load temporarily, not stop using your hand indefinitely. If a task causes a sharp flare, try changing the grip, using a larger contact surface, or breaking the task into shorter periods.

Use a jar-opening aid or nonslip grip instead of repeatedly forcing a tight lid with a small pinch.
Carry heavier items with the whole hand or both hands when possible, rather than hanging them from the thumb and index finger.
Choose larger-handled pens, utensils, or tools if small handles provoke pain.
Alternate demanding hand tasks with lighter activities, and allow symptoms to settle after a flare.
Avoid aggressive self-stretching, forceful joint manipulation, or repeated painful squeezing without an individualized plan.

A comfortable amount of hand use is usually preferable to complete avoidance. If pain is persistent, a therapist or qualified hand specialist can help determine which modifications are worth keeping and which can be gradually reduced as tolerance improves.

Should I Wear a Thumb Brace or Splint?

For people with confirmed thumb CMC osteoarthritis, a thumb orthosis can sometimes reduce pain during demanding tasks. The 2019 American College of Rheumatology/Arthritis Foundation guideline strongly recommends first-CMC hand orthoses as an option. A 2025 British Society for Surgery of the Hand guideline recommends starting with supported self-management and considering a splint when symptoms have not responded sufficiently.

The best choice depends on comfort, the activities being performed, the joints needing support, and whether the device interferes with useful hand movement. A brace is not necessarily required all day, and wearing an ill-fitting brace can create new pressure points. An occupational therapist or qualified hand therapist can help with fitting and appropriate use. Bracing is a tool for symptom management, not a cure for cartilage changes.

Can Physical Therapy Help?

Yes, physical therapy may help with the movement and functional problems associated with thumb-base pain. Treatment is individualized after assessment and may include education, graded hand and forearm strengthening, movement-control exercises, strategies for gripping and pinching, and a realistic home program. A therapist may also address stiffness or weakness in the wrist and upper extremity when these impairments affect hand function.

For thumb CMC osteoarthritis, the aim is to improve how comfortably the hand performs meaningful tasks. A program might begin with low-irritability thumb motion and gentle muscle activation, then progress toward controlled pinch, grip, and task-specific practice as tolerated. The therapist should reassess symptoms, functional goals, and response rather than using the same exercises for everyone.

A physical therapist can also recognize when the presentation suggests a need for medical evaluation, a certified hand therapist, or occupational therapy. California physical therapists evaluate and treat movement-related impairments within their licensed scope; they do not use their PT license to diagnose disease. For more about Nova’s general rehabilitation approach, see Nova Physical Therapy services.

What Kinds of Exercises May Be Used for Thumb-Base Pain?

A supervised plan may use comfortable thumb opposition, gentle range-of-motion activities, controlled opening of the thumb away from the palm, or low-load isometric activation of selected thumb muscles. As symptoms allow, it may progress toward coordinated pinch and grip activities that resemble the patient’s daily tasks. Some programs also train joint-position awareness, sometimes called proprioception.

The correct resistance, frequency, and range depend on the person’s symptoms, irritability, joint stability, and other health factors. Stronger squeezing is not automatically better. Exercises should be adjusted if they repeatedly cause sharp pain, swelling, or a lasting increase in symptoms. A qualified clinician can help distinguish tolerable effort from a poorly matched exercise.

Can Heat, Massage, or Paraffin Help?

Some people find gentle warmth soothing when the hand feels stiff. Heat-based modalities may be used as an adjunct for comfort when appropriate, but they do not replace strengthening, education, and practical changes to hand use. Hands with impaired sensation, circulation problems, or certain medical conditions require special precautions with heat. Massage and hands-on treatment may be considered for selected movement restrictions, but neither should be presented as a way to rebuild worn cartilage.

Nova Physical Therapy lists therapeutic exercise, patient education, and paraffin bath among its general services. Whether a particular modality is appropriate for thumb symptoms depends on evaluation findings, available expertise, and the treatment plan; it should not be assumed that every patient needs or will receive it.

What Does Research Say?

2026 randomized trial: A multicenter study published in Osteoarthritis and Cartilage enrolled 166 adults with thumb CMC osteoarthritis at 18 Dutch clinics. Adding exercise therapy to an orthosis did not significantly improve the primary pain outcome at three months compared with an orthosis alone. However, the exercise-plus-orthosis group had favorable results on several secondary measures, including some hand-function, work-ability, satisfaction, and grip outcomes. The authors favored the combined approach while acknowledging that the main pain outcome was not different. Read the 2026 trial.

2026 systematic review: A review of five randomized trials involving 260 participants reported that adding proprioceptive training to conventional rehabilitation improved several short-term measures of pain, hand function, joint-position awareness, and strength. The studies differed in methods, and the authors called for larger trials and longer follow-up. These findings are promising, not proof that a particular exercise routine will work for every patient. Read the 2026 review.

2025 network meta-analysis: A review combining 22 randomized or quasi-randomized trials found that multimodal treatment and hand exercises improved some short-term outcomes, while certain rigid splints helped with medium-term function. Long-term comparative evidence remained limited. Read the 2025 analysis.

Guidelines: The 2025 British Society for Surgery of the Hand recommendations favor a stepwise, self-management-first approach, with splints considered when needed. The American College of Rheumatology/Arthritis Foundation guideline recommends exercise for hand osteoarthritis and strongly recommends first-CMC orthoses. Treatment decisions should reflect symptoms, goals, preferences, and the clinical picture. Read the 2025 guideline; read the ACR/AF guideline.

Taken together, the evidence supports conservative care as a reasonable first approach for many patients, but the size and durability of benefit vary. Research does not support promising that exercise, splints, paraffin, or any single intervention can eliminate arthritis or prevent surgery in every case.

What Happens During a Physical Therapy Evaluation?

A physical therapy evaluation begins with the story behind the symptoms: when they started, whether an injury occurred, which tasks are difficult, how long pain lasts after activity, and whether there is swelling, numbness, or weakness. The therapist may ask about prior imaging or a medical diagnosis, work and home demands, and what the patient hopes to do more comfortably.

The examination may assess thumb and wrist motion, pain behavior during functional tasks, grip and pinch performance, coordination, and the contribution of nearby joints. The therapist may also screen sensation and other findings that could indicate a different condition. For example, opening a jar or turning a simulated key may help identify how the hand is being loaded.

The resulting plan may include measurable goals, activity modification, a trial of appropriate exercises, education, and coordination with the referring clinician or hand specialist. If the findings suggest inflammatory disease, fracture, ligament disruption, or another condition outside physical therapy’s scope, medical referral is appropriate.

When Should You Seek Medical Attention?

Seek prompt medical assessment for severe pain after a fall or other injury, visible deformity, inability to move the thumb normally after trauma, rapidly increasing swelling, or new significant numbness or weakness. A joint that is hot, very swollen, and accompanied by fever or feeling unwell needs urgent medical attention. These symptoms should not be managed as routine arthritis without assessment.

Arrange a nonurgent medical evaluation if thumb pain persists, keeps worsening, interrupts sleep or daily activities, or does not improve with reasonable adjustments. A clinician can determine whether imaging, medication discussion, splint fitting, hand therapy, or specialist referral is indicated. Physical therapy is not a substitute for medical evaluation when the cause is uncertain or potentially serious.

Why Patients Choose Nova Physical Therapy — We Care

At Nova Physical Therapy in North Hollywood, our guiding principle is simple: We Care. We emphasize individualized assessment, clear patient education, functional goals, and treatment plans that make sense in everyday life. For someone struggling with hand discomfort, the meaningful goal may be cooking, writing, working, driving, or managing household tasks with greater confidence.

Nova provides outpatient physical therapy for musculoskeletal and movement-related problems and serves North Hollywood and nearby communities, including Burbank, Toluca Lake, Studio City, Valley Village, and the greater Los Angeles area. Because thumb pain sometimes benefits from specialized hand therapy or medical evaluation, patients should contact the clinic to discuss whether our services are the right fit or whether a hand specialist referral would be more appropriate.

Frequently Asked Questions

1. Is pain at the base of my thumb always arthritis?

No. Thumb CMC osteoarthritis is one possibility, but tendon irritation, ligament injury, other joint problems, and nerve-related conditions can produce overlapping symptoms. A medical diagnosis should not be made from pain location alone.

2. Why does opening a jar hurt more than holding a light object?

Opening a tight jar often combines stronger pinch, grip, and twisting forces. A sensitive thumb joint or tendon may tolerate a light object but become painful under higher rotational load.

3. Can thumb arthritis cause weakness when I grip?

Yes. Pain, stiffness, altered movement strategies, and muscle performance changes can make gripping or pinching feel weaker. Persistent or sudden weakness should be assessed rather than assumed to be arthritis.

4. Is thumb-base pain the same as De Quervain tenosynovitis?

No. They involve different structures, although symptoms can overlap. De Quervain typically affects tendons along the thumb-side of the wrist; CMC arthritis involves the joint at the thumb base. A clinician can help distinguish them.

5. Can physical therapy reverse thumb arthritis?

No. Exercise and rehabilitation may improve pain, strength, movement tolerance, and daily function, but they have not been shown to restore worn joint cartilage or reverse osteoarthritis.

6. Do thumb braces actually help?

They can help some people with diagnosed thumb CMC osteoarthritis, particularly during painful tasks. Fit, comfort, type, and timing of use matter. A therapist or hand specialist can guide selection.

7. Should I stop using my thumb until the pain disappears?

Usually, complete avoidance is not the goal. Modifying highly painful tasks while maintaining comfortable movement and gradually rebuilding tolerance may be more useful. Follow injury-specific restrictions if a clinician has given them.

8. Are thumb strengthening exercises safe?

Often, but the correct exercises and loads depend on the cause of symptoms. Painful high-resistance pinching is not an ideal starting point for everyone. An individualized assessment helps determine what is appropriate.

9. Does texting cause thumb arthritis?

Current evidence does not establish that texting alone causes thumb CMC osteoarthritis. Repetitive use can aggravate symptoms in a sensitive hand, but arthritis has multiple contributing factors.

10. Is heat or paraffin better than exercise?

Warmth may provide temporary comfort for some people, but it does not replace an individualized rehabilitation and self-management plan. The best combination depends on the examination and the patient’s goals.

11. Will I need an X-ray for thumb pain?

Not always. A medical clinician decides whether imaging is needed based on the history, examination, severity, trauma, and whether the results would change care. Imaging findings and symptoms do not always match.

12. When should I see a hand specialist instead of a physical therapist?

Specialist assessment is important after significant trauma, suspected fracture or ligament injury, marked deformity, progressive neurologic symptoms, or persistent symptoms despite appropriate conservative care. A PT can help identify when referral is needed.

Schedule an Evaluation

If thumb or hand pain is making daily activities difficult, contact Nova Physical Therapy to discuss your symptoms and whether a physical therapy evaluation is appropriate. Our team can explain available services and help you determine whether a physician, occupational therapist, or specialized hand therapist should be involved.

Nova Physical Therapy
4795 Vineland Ave, Suite E, North Hollywood, CA 91602
Phone: (818) 639-3402
Contact Nova Physical Therapy | Explore our services.

Disclaimer

This article is for general education and is not a medical diagnosis, individualized exercise prescription, or substitute for care from a qualified healthcare professional. Pain at the thumb base has several possible causes. California physical therapists evaluate and treat movement-related impairments within the Physical Therapy Practice Act and refer for medical evaluation when appropriate; a physical therapy license does not authorize diagnosis of disease. Physical Therapy Board of California — Practice Act.