What is a lumbar strain, and what does it feel like?

A lumbar strain is injury to muscle or its tendon, typically from a load applied faster than the tissue could organize against — a lift with rotation, a slip, a bag heavier than expected. It hurts immediately or within a day, it is worse on the movements that use the injured tissue, and it improves measurably week over week.

That last feature is the one that matters diagnostically. Real strains get better. Not linearly, and not without setbacks, but the trend over three or four weeks points down. A back that is exactly as bad at week six as it was at week one was not a strain, or was not only a strain.

What can be mistaken for a pulled back muscle?

• A facet joint sprained in the same moment — same mechanism, different structure, and it does not resolve on the muscular timeline. Facet syndrome.
• An annular tear, which hurts with sustained flexion and sitting rather than with contraction.
• A sacroiliac joint loaded in the same lift. The SI joint.
• A compression fracture, in anyone with osteoporosis or long-term steroid use, where the mechanism can be trivial. Compression fracture.

How do you treat a lumbar strain in the first two weeks?

Relative rest for a day or two, not bed rest. Movement within tolerance from the start, because immobilized muscle loses cross-sectional area fast and a smaller extensor mass pushes load onto the passive structures that hurt more. Heat over ice, since the dominant problem is guarding rather than swelling.

Then progressive reloading rather than waiting for zero pain. Tissue adapts to demand and to nothing else. Waiting until it stops hurting to start moving produces a back that is weaker at week eight than it was at week one, which is how a two-week problem becomes a two-year one. The first two weeks in detail.

Why is my lumbar strain not healing?

Muscle repair is a construction project with a supply chain. It needs protein, it needs the anabolic window that slow-wave sleep provides, and it needs perfusion. Chronic hyperinsulinemia impairs the microvasculature that delivers all of it, and a persistently inflammatory state keeps tissue in a degradative rather than a rebuilding mode.

The occupational layer decides the rest. A strain that gets four weeks of modified duty behaves differently from the same strain that goes back to full pick rate on day three because the alternative is losing the shift. That is not a motivation problem and it should not be treated as one.

Frequently asked questions

How long does a pulled back muscle take to heal?

Typically a few days to a few weeks, with the trend improving throughout. Persisting unchanged past six weeks warrants a proper examination rather than more patience.

For what a normal recovery looks like day by day, read the first two weeks.

Should I stretch it?

Gentle range within comfort, yes. Aggressive stretching into pain during the acute phase tends to provoke more guarding, not less.

When should I get imaging?

Rarely for a straightforward strain. Imaging earns its place when there is a neurological deficit, a red flag, or a mechanism that raises fracture risk in someone with thin bone. Six weeks, absent a red flag, is the threshold worth holding.

What causes a lumbar strain?

A load that arrives faster than the muscle or tendon can organize against it. The usual moments are a lift with a twist, a slip, or a bag that turns out heavier than expected. The pain starts right away or within a day, and it is worse on the movements that use the injured tissue. A strain that follows a trivial movement in someone with thin bone deserves a closer look.

Should I walk with a lumbar strain?

Yes. Take relative rest for a day or two, not bed rest, and keep moving within what you can tolerate from the start. Muscle that sits still loses size quickly, and a weaker back pushes more load onto the joints and discs that hurt more. After the first days, build the load back up step by step instead of waiting for the pain to reach zero.

Is heat or ice better for a pulled back muscle?

Heat, for most strains. The main problem in a strained lower back is guarding, the muscles clamping down around the injury, rather than swelling, so heat fits the problem better than ice does. Pair it with relative rest for a day or two, not bed rest, and gentle movement within tolerance. The aim of any comfort measure is to let you move more, because loading is what rebuilds the tissue.

Is a lumbar strain permanent?

A genuine strain is not. It has a good natural history and trends down over three or four weeks, with setbacks along the way. Two things turn it into a long problem: waiting for the pain to stop before moving, which leaves the back weaker at week eight than at week one, and a diagnosis that was wrong from the start. A back unchanged at six weeks was likely not only a strain.

For a pulled back muscle, our page on heat or ice for back pain explains which one suits a new strain and which suits a stiff one.

Related reading

• Back spasms
• The first two weeks
• Lumbar facet syndrome
• Compression fracture

Most backs that go on a Tuesday went for no reason anybody can name. The event you remember is a timestamp, not a cause.

The pain that shows up on day three after a collision is the one people are talked out of.