Pulled Back Muscle: What to Do in the First 72 Hours

You pulled something in your back. You know the exact moment it happened, and you are now very careful about how you breathe. What you do in the next three days has a meaningful effect on how long this takes to settle. The evidence is clear on a few things, and one of them is that the most natural response, lying still until it stops hurting, is the wrong one.

A muscle strain is one of the most common causes of acute low back pain, and the good news is that it is self-limiting: the tissue heals. The bad news is that the first 72 hours feel disproportionately terrible compared to the actual severity of the injury, and the wrong management during this window can turn a two-week problem into a six-week one. This is not a scare tactic. The Malmivaara trial, published in the New England Journal of Medicine, found that patients who continued ordinary activities as tolerated recovered faster than those who rested in bed [2]. The evidence has been consistent since: early movement beats immobility.

What is happening

A pulled muscle (strain) means muscle fibers in the lumbar region have been overstretched or partially torn. The body responds with inflammation and protective muscle spasm. The inflammation is part of healing: it brings blood flow, immune cells, and repair factors to the damaged tissue. The spasm is your nervous system overprotecting the area, locking the muscles around the injury site to prevent further movement. Both contribute to the pain. The acute phase, the worst of it, typically lasts 48 to 72 hours.

The severity of a muscle strain ranges from mild (a few fibers overstretched, minimal tearing) to severe (significant partial or complete tear). Most back muscle strains are mild to moderate. The pain is dramatic, but the underlying tissue damage is modest. The muscles involved are usually the erector spinae or multifidus, the long muscles that run alongside the spine and control lumbar extension and rotation.

The protective spasm deserves attention because it is both helpful and counterproductive. In the first hours, it prevents movements that could worsen the tear. After the first day, the spasm itself becomes a source of pain: the contracted muscle compresses its own blood supply, accumulates metabolic waste products, and generates additional pain signals. This is why early gentle movement helps. It breaks the spasm cycle and restores blood flow to the area without reinjuring the tissue.

Hours 0 to 12: the acute phase

The pain is at its worst. Movement feels dangerous. It is not, in most cases, but the nervous system is sending very convincing signals to stop. Here is what to do:

Move to a comfortable position. Lying on your back with knees bent (feet flat or knees over a pillow) reduces load on the lumbar spine. Side-lying with a pillow between the knees also works. Choose whichever position reduces the pain most. If you are on the floor and cannot get up easily, roll onto your side, push yourself to a seated position using your arms, and stand from there. Do not try to sit straight up from lying flat.

Apply ice for 15 to 20 minutes at a time with a cloth barrier. This can reduce the initial inflammatory response, though the evidence for ice in back pain is limited [4]. It is low-risk and worth trying. Apply every 2 to 3 hours during the first 12 hours. Remove the ice when the skin feels numb and allow the area to return to normal temperature before reapplying.

Take NSAIDs if you can. The ACP guideline recommends NSAIDs (ibuprofen, naproxen) as a first-line pharmacological option for acute low back pain [1]. Take them with food, at the labeled dose, and only if you have no contraindications (stomach ulcers, kidney problems, certain medications). NSAIDs reduce both pain and inflammation, which is relevant because the inflammatory response, while necessary, can overshoot in the acute phase.

Avoid the thing that caused the injury. If you pulled the muscle lifting, do not attempt to lift anything for the rest of the day. If twisting caused it, minimize rotation. This seems obvious, but the urge to “test it” is common and counterproductive.

Hours 12 to 48: the critical window

This is where the evidence diverges sharply from instinct. Your back still hurts, and lying still feels like the right thing to do. The Malmivaara trial found that patients who continued ordinary activities as tolerated recovered faster than those who rested in bed [2]. The NICE guideline for low back pain reinforces this: it recommends encouraging people to continue with normal activities and does not recommend bed rest [3].

Get up and move gently. Walk slowly around the house. Change positions every 30 to 60 minutes. The movement does not need to be ambitious: standing up, walking to the kitchen, sitting in a different chair. Each position change tells the nervous system that movement is safe and reduces the splinting reflex.

The key principle is this: pain during gentle movement does not mean damage is occurring. The tissue is already healing. The pain is the nervous system’s protective response, and it is calibrated to the initial severity of the injury, not to the current state of the tissue. By 24 hours, the tissue is already less vulnerable than the pain level suggests. Gentle movement within tolerable limits is safe and beneficial.

Switch from ice to heat after 24 to 48 hours. Superficial heat (a heat pad or warm shower) promotes blood flow to the area and reduces muscle spasm. The Cochrane review on heat therapy found it provides modest short-term pain relief [4]. Heat wraps that can be worn continuously are practical for maintaining warmth during normal activities.

Avoid provocative movements but not all movements. If twisting caused the strain, avoid twisting. If lifting caused it, avoid heavy lifting. The specific movement that caused the injury is the one to avoid; other movements are safe and beneficial.

Continue NSAIDs on a regular schedule for the first 48 to 72 hours if they are helping. Taking them consistently maintains the anti-inflammatory effect; waiting until the pain returns and then taking a single dose is less effective.

Hours 48 to 72: turning the corner

The inflammatory peak has passed. Muscle spasm is beginning to settle. Pain should be noticeably less intense, even if still present. If pain is unchanged or worse at 72 hours, this warrants reassessment of whether the cause is a simple strain.

Increase walking distance. Aim for multiple short walks (5 to 10 minutes) rather than one long one. Walking is the best early exercise after a muscle strain because it gently activates the lumbar extensors without significant loading.

Begin gentle stretching within comfortable range. Knee-to-chest stretches and cat-cow movements are reasonable starting points, keeping the movement within pain-free or near-pain-free range. For the cat-cow: on all fours, alternate between gently arching the lower back (cow) and rounding it (cat). Move slowly through a small range. 10 repetitions, 2 to 3 times a day. This restores spinal mobility without heavy loading.

Seated rotation stretches can begin if rotation was not the mechanism of injury. Sit in a chair, cross your arms over your chest, and gently rotate to each side. Stop at the first sensation of pull, not the first sensation of pain. Hold for 5 seconds each side. 5 repetitions.

Days 4 to 14: recovery phase

By day four, most mild strains allow a return to light daily activities with some discomfort. The trajectory is progressive: each day should be slightly better than the previous one, even if the improvement is small.

Resume light core activation. Gentle posterior pelvic tilts (lying on your back, flattening the lower back into the floor) and supported bridges (lying on your back, lifting the hips with feet flat) begin reactivating the muscles that were inhibited by the spasm. 2 sets of 10, once a day initially.

Return to work is appropriate for most desk jobs by day three to five, with modifications: change positions frequently, take short walking breaks every 30 to 45 minutes, and avoid prolonged static sitting. For physically demanding work, the timeline depends on the severity of the strain and the specific demands of the job.

Pain that has not improved at all by day 14 warrants a clinical assessment. A simple muscle strain should show clear improvement by two weeks, even if it is not fully resolved. No improvement at all suggests either a more severe strain, a different diagnosis (disk involvement, facet injury), or factors that are slowing recovery (significant deconditioning, fear-avoidance behavior, or sustained high-load demands).

What the evidence does not support

Muscle relaxants (cyclobenzaprine, diazepam) are sometimes prescribed for back muscle spasm. A Cochrane review found they provide short-term pain relief but with significant side effects, particularly drowsiness [5]. NICE does not recommend them as first-line treatment [3]. They may be appropriate for severe spasm that is not responding to NSAIDs and heat, but they are not a default prescription.

Bed rest beyond one to two days is associated with worse outcomes in clinical trials [2]. Complete immobility for a pulled back muscle is outdated advice. It slows tissue healing, promotes deconditioning, and reinforces the nervous system’s protective overreaction.

Aggressive stretching or deep massage in the first 48 hours can increase tissue damage and inflammation. Wait until the acute phase has passed before any deep tissue work. Gentle movement is not the same as aggressive manual therapy: the former helps, the latter can set recovery back.

Imaging (X-ray or MRI) is not recommended for a straightforward muscle strain in the first six weeks, unless red flags are present [3]. A muscle strain does not show on an X-ray, and an MRI is likely to show incidental findings (disk bulges, degenerative changes) that are unrelated to the current injury and may cause unnecessary alarm.

Red flags: when to see a doctor

A pulled back muscle does not cause neurological symptoms. If you develop leg weakness, difficulty controlling your bladder or bowels, or numbness in the groin area, these are not muscle strain symptoms and require prompt medical attention. These are signs of cauda equina compression, which is a surgical emergency.

Pain that worsens steadily over the first 72 hours rather than plateauing, pain that is constant and does not change with position, or pain accompanied by fever also warrants prompt assessment.

When to see a doctor. If your back pain is severe, getting worse, or accompanied by bladder or bowel changes, leg weakness, or numbness in the groin or inner thighs, seek medical care promptly. A GP or physical therapist can assess whether imaging or specialist referral is appropriate.