Back Spasms: What to Do in the First Few Days
By Nova Physical Therapy, an outpatient physical therapy clinic in North Hollywood, CA | Published October 2026
You bend down to tie your shoe or lift a bag of groceries, and suddenly your lower back seizes up. Standing straight feels impossible, every movement is guarded, and you're not sure whether to lie down or keep going.
A back spasm can be painful and frightening, but it's usually not a sign of serious damage. This article explains what a back spasm feels like, why it happens, what to do in the first few days, and when back pain needs medical attention.
The short answer
A back spasm is a sudden, involuntary tightening of the muscles in your back, often triggered by a movement, lift, or twist. It can be very painful, but most episodes of acute back pain improve over time (American College of Physicians). In the first few days, gentle movement, comfortable positions, and heat tend to help more than bed rest. Heat wraps have moderate evidence for reducing short-term pain and disability (Cochrane review). If you have warning signs like numbness in the groin area or bladder changes, get emergency care.
What does a back spasm feel like?
People often describe a back spasm as:
• A sudden, gripping or cramping pain in the lower back
• Muscles that feel hard, tight, or "locked up"
• Trouble standing up straight, bending, or turning
• Pain that eases when you stay still and flares when you move
• Leaning to one side without meaning to
The intensity can be alarming, especially in the first day or two. The muscles are often acting like a protective brace, tightening up to limit movement in an area that's irritated.
Why do back spasms happen?
Back spasms often start with a strain or irritation of the muscles, joints, or other tissues of the back. The surrounding muscles then tighten to protect the area. Common triggers include:
• Lifting, bending, or twisting, sometimes even something light
• A sudden jump in activity, like a weekend of yard work, moving furniture, or a new workout
• Long periods sitting followed by a sudden movement
• Fatigue, stress, and poor sleep, which can make the back more sensitive
• Low overall strength or conditioning for the demands of your day
Often there isn't one clear cause. A back spasm doesn't usually mean anything is "out of place" or broken.
What should I do in the first few days?
Day 1 to 3: calm things down, but keep moving gently
• Find comfortable positions. Many people feel better lying on their back with a pillow under their knees, or on their side with a pillow between their knees.
• Move a little, often. Get up every hour or so, even just to walk around the house. Short, gentle walks are usually safe.
• Use heat. A wrapped heat pack can help tight muscles relax.
• Avoid long bed rest. Staying in bed for days tends to make stiffness and pain last longer.
• Skip heavy lifting and hard workouts for now.
Day 3 onward: build back up
• Gradually walk a bit farther each day
• Return to normal daily activities as you're able, even if they're a little uncomfortable
• Try gentle movements that feel good, such as pulling one knee toward your chest or slowly rocking your knees side to side while lying on your back
• Ease back into lifting, sports, and the gym over the following weeks
Questions about pain medication or muscle relaxers are best directed to your physician.
Should I use heat or ice?
Heat has the better research support. A Cochrane review found moderate evidence that heat wrap therapy reduces pain and disability in the short term for back pain lasting under three months, and adding exercise appeared to give extra benefit. The same review found there wasn't enough evidence to judge cold for back pain (French et al., Cochrane). The American College of Physicians also lists superficial heat among the non-drug treatments it recommends for acute low back pain (Qaseem et al., 2017).
That said, some people find ice more comfortable, and that's fine. Use whichever feels better, wrap it in a towel to protect your skin, and limit sessions to about 15 to 20 minutes. Don't use heat or ice over numb skin.
When can I move normally again?
It varies. Many people notice the worst spasm easing within a few days and continue to improve over the following weeks. The more you can gently keep moving, the better recovery tends to go.
If you've had back spasms before, or they keep coming back, that's a good reason to look at strength, conditioning, and the activities that tend to trigger them.
How can physical therapy help?
A physical therapist can help you move more comfortably now and lower the chance of future flare-ups. An evaluation may include:
• How the spasm started and what makes it better or worse
• How you bend, sit, stand, walk, and lift
• Strength and flexibility of your back, hips, and legs
• Screening for signs that need a physician's evaluation
The APTA's low back pain guideline supports exercise, manual therapy, and education for acute low back pain (George et al., JOSPT 2021). A typical plan may include:
• Gentle movements to ease the spasm and restore motion
• Hands-on treatment, when it helps you move more comfortably
• Strengthening for the trunk, hips, and legs, progressed over time
• Practice with lifting and the tasks that triggered your pain
• A home program to help prevent future episodes
Physical therapy doesn't guarantee a specific result or timeline.
At Nova Physical Therapy in North Hollywood, back and neck pain is one of our core services, and every plan starts with an evaluation so treatment fits what we find.
When should I see a doctor?
Call 911 or go to the emergency room if back pain comes with (NHS):
• Numbness around your genitals, buttocks, or inner thighs
• New trouble controlling your bladder or bowels, or trouble starting to urinate
• Pain, tingling, weakness, or numbness in both legs
• Chest pain
• Back pain after a serious fall or car accident
See a physician promptly if you have back pain along with:
• A fever or feeling generally unwell
• Unexplained weight loss
• A history of cancer
• Pain that's worse at night or doesn't ease with rest or changing position
• Leg weakness that is getting worse
• Pain that isn't improving after a few weeks, or that stops you from doing daily activities
We screen for these signs during every evaluation and refer you to a physician when findings call for medical assessment.
Do I need a referral for physical therapy in California?
Not to get started. California allows direct access to physical therapy. A physical therapist can evaluate and treat you without a referral for up to 45 calendar days or 12 visits, whichever comes first. After that, a physician or podiatrist needs to sign the plan of care for treatment to continue. Your insurance plan may have its own referral rules, so check your coverage.
Frequently asked questions
How long does a back spasm last?
The worst of a spasm often eases within a few days, with continued improvement over the following weeks. Keeping gently active usually helps.
Should I stretch a back spasm?
Gentle movement that feels good is usually helpful. Avoid forcing deep stretches that make the pain sharply worse, especially in the first day or two.
Is it okay to walk with a back spasm?
Yes, for most people. Short, gentle walks are one of the best things you can do. Build up the distance gradually.
Why does my back spasm when I stand up?
Standing up after sitting or lying down asks the irritated area to move and take load again. Moving slowly, using your arms to help, and getting up more often can make it easier.
Can stress cause back spasms?
Stress and poor sleep can make the back more sensitive to pain and may contribute to flare-ups, though they're rarely the only factor.
Do I need an X-ray for a back spasm?
Most people don't need imaging for a typical back spasm. Imaging decisions are made by your physician, often when there are warning signs or symptoms aren't improving.
Do I need a referral to see a physical therapist?
No, not to start. California allows direct access within the limits described above.
About Nova Physical Therapy
Nova Physical Therapy is an outpatient physical therapy clinic in North Hollywood, California, led by a Doctor of Physical Therapy. We help people recover from back and neck pain, sports injuries, work injuries, auto accident injuries, knee pain, and shoulder problems, and we also work with balance problems and rehab after surgery. Patients come to us from North Hollywood, Burbank, Studio City, Toluca Lake, Valley Village, and across the San Fernando Valley. Learn more about Nova or see our services.
Schedule an evaluation
If a back spasm has you moving stiffly, or spasms keep coming back, an evaluation can help sort out what is driving them and which next steps fit you.
Nova Physical Therapy
4795 Vineland Ave #E, North Hollywood, CA 91602
Call (818) 639-3402 | Book an appointment online
Disclaimer
This article is for general education only. It is not medical advice, a diagnosis, or a treatment recommendation for any individual. Back pain has many causes, and only an in-person evaluation can determine what is right for you. No treatment guarantees symptom resolution, and results vary. Physical therapists evaluate movement and function within their scope of practice and refer to physicians when findings warrant. Physical therapy in California is regulated by the Physical Therapy Board of California.
References
1. Qaseem A, Wilt TJ, McLean RM, Forciea MA. Noninvasive Treatments for Acute, Subacute, and Chronic Low Back Pain: A Clinical Practice Guideline From the American College of Physicians. Ann Intern Med. 2017. Link
2. American College of Physicians. ACP issues guideline for treating nonradicular low back pain. Link
3. French SD, et al. Superficial heat or cold for low back pain. Cochrane Database Syst Rev. 2006. Link
4. George SZ, Fritz JM, Silfies SP, et al. Interventions for the Management of Acute and Chronic Low Back Pain: Revision 2021. J Orthop Sports Phys Ther. 2021;51(11):CPG1–CPG60. Link
5. NHS. Back Pain. Link