Pulled a Muscle in Your Lower Back? It's Probably Not That
Why "pulled muscle" is the most common misdiagnosis in lower back pain
You bent down to pick something up. Reached for something awkwardly. Twisted at an odd angle. Something went — and now you're convinced you've pulled a muscle.
It's the most common explanation people give for lower back pain. It's also, in most cases, probably wrong.
What a true muscle strain actually is
The assumption makes intuitive sense. Your back hurts, your muscles feel tight and in spasm, therefore your muscles must be the problem. But the presence of muscle pain doesn't mean the muscles are the source of the injury. In the lower back, muscle symptoms are almost always a response to something else — not the primary problem itself.
Understanding why requires a brief look at what a true muscle strain actually is.
What's actually happening when your back "goes"
A muscle strain involves the tearing of muscle fibres. Muscles are highly vascularised tissue — they have a rich blood supply — which means when they tear significantly, they bleed. That bleeding produces bruising. If you've genuinely strained a muscle badly enough to cause the kind of pain that stops you in your tracks, you'd expect to see bruising develop over the following days.
Most people with acute lower back pain don't bruise. Which is the first clue that something other than muscle is involved.
The muscles of the lower back are also remarkably strong and load tolerant. They're designed to handle substantial forces repeatedly throughout the day. The idea that everyday movements — bending, lifting, twisting — would routinely overload and tear them doesn't hold up well against what we know about the load tolerances of spinal tissue. Other structures in the lower back — particularly the intervertebral discs — are under far greater compressive and shear forces, and are therefore considerably more susceptible to injury.
Why ligaments are rarely the problem either
Ligaments connect bone to bone and are built to be tough. Their job is stability — resisting excessive movement at each spinal segment. The posterior longitudinal ligament, for example, runs down the back of the vertebral bodies and acts as a natural restraint against disc herniation.
True ligament sprains in the lower back do occur, but they typically require significant trauma — a fall, an impact, a road traffic accident. The kind of forces involved in everyday movements that trigger most lower back pain episodes are unlikely to sprain spinal ligaments. Like muscle pain, ligament pain in the lower back is more often a secondary response than the primary cause.
What the muscle spasm is telling you
Muscle spasm in the lower back is a signal, not a diagnosis. It's the body saying something nearby needs protecting. Treating the spasm in isolation — stretching it out, applying heat, having it massaged — can provide temporary relief because it reduces the secondary response. But it doesn't touch whatever the muscles are guarding.
This is why lower back pain that's treated purely as a muscle problem so often recurs. The spasm settles, the person feels better, they go back to normal activity, and two weeks later the same thing happens again. Because the disc or facet joint that triggered the original response was never properly assessed or addressed.
Muscular fatigue and ischaemia
There is one genuinely muscular cause of lower back pain worth acknowledging — muscular fatigue. When muscles sustain prolonged contraction, blood flow through them is reduced. Waste products accumulate and the result is a deep, heavy aching pain. While disc injuries can also produce a similar dull, toothache-like quality, muscular ischaemia tends to build gradually under sustained load rather than starting with a specific incident, and is more reliably relieved by movement and position changes. This is muscular ischaemia — essentially the muscle being starved of adequate blood flow under sustained load.
It's common in people sustaining prolonged standing or loaded postures where the lumbar muscles are working continuously to maintain position. The pain tends to build gradually under load and is temporarily relieved by movement and position changes. A useful clue is the instinct to bend forwards to stretch the back out after prolonged standing — this offloads the posterior muscles and tends to relieve ischaemic pain, whereas a disc injury would typically find that position aggravating rather than relieving.
Managing it involves addressing the loading pattern — regular movement breaks, postural variation, and building the endurance capacity of the relevant muscles so they can sustain load for longer without fatiguing.
What to do about it
In the acute stage — the first 48-72 hours — the priority is managing the pain and the secondary muscle response while the acute inflammation settles.
Applying something cold — an ice pack or a bag of frozen peas wrapped in a cloth — to the lower back for 15-20 minutes at a time can help reduce inflammation and ease the muscle spasm around the injured area. It won't fix the underlying cause but it can make those first difficult days more manageable.
Heat can be particularly helpful for ischaemic muscle pain — unlike disc or joint injuries where cold is more appropriate in the acute stage, warmth increases blood flow to the fatigued muscle, helps clear the accumulated waste products and relieves the aching. A hot water bottle or heat pack applied to the area for 15-20 minutes provides genuine relief rather than just masking the pain.
Gentle movement is better than rest. Complete rest allows the muscles to stiffen further and can actually slow recovery. Moving within pain tolerance — short walks, gentle position changes — keeps the surrounding tissue from seizing up while the acute phase passes.
Over the counter anti-inflammatories can help in the short term if appropriate for you. Speak to a pharmacist if you're unsure.
When to get it properly assessed
If your pain isn't improving within a few days, is severe, or is accompanied by any nerve symptoms — shooting pain into the leg, tingling, numbness or weakness — a proper assessment is important. Understanding what's actually causing the pain, rather than assuming it's muscular, is the difference between a problem that resolves properly and one that keeps coming back.
If you're based in Manchester or Didsbury, I offer initial appointments at Holland Osteopathy where we'll identify the actual source of your pain and put together a plan to address it properly. Book online below.