Lumbar Muscle Strain (Acute Back Spasm)

Overview

Almost everyone knows someone who has "put their back out": they bent to pick up a bag, twisted to reach the back seat of the car, or lifted something heavy at the gym, and felt a sudden grab of pain in the lower back. Within hours the muscles tighten into a protective spasm, standing up straight becomes difficult, and getting out of bed the next morning is a slow, careful process.

This is an acute lumbar strain. The muscles and ligaments that support the lower spine have been overstretched or sustained a small tear, and the surrounding muscles clamp down to protect the area. The pain is often intense, which understandably causes alarm, but the injury itself is usually minor. Most acute strains improve markedly within one to two weeks and settle within about six weeks.

The key to recovery is reassurance and gentle movement. Prolonged bed rest, bracing and fear of moving tend to slow things down, while early, graded activity helps the spasm release and prevents a one-off episode becoming a recurring problem.

Causes and risk factors

• Lifting a heavy or awkward object, particularly with a bent and twisted back
• Sudden twisting, reaching or bending movements
• Lifting when cold, tired or distracted
• A sharp increase in training, such as a new deadlift or squat load
• Weak or deconditioned trunk and hip muscles
• Prolonged sitting beforehand, which leaves the back stiff and less prepared for load
• Previous episodes of back strain

How we may be able to help

Even with a clear lifting incident, we assess thoroughly to make sure nothing more significant is going on. We check your lumbar movement, feel for the areas of spasm, examine your hips and run a neurological screen of your legs. We explain what has happened and why it hurts so much, which in itself often eases the anxiety that feeds muscle guarding.

Early treatment focuses on calming the spasm and restoring movement. Our physiotherapists use gentle manual therapy and soft-tissue techniques, then give you a few simple movements to repeat through the day. Once the acute phase has eased, our chiropractor can address any stiff lumbar segments with mobilisation or manipulation so you return to full movement, and we help you recondition the back with progressive strengthening and lifting technique.

Dry needling is particularly effective for the tight bands of muscle that form after a strain. Interferential therapy may be used in the first days to help with pain and muscle spasm. If you have had several episodes, a 3D posture scan can reveal postural factors that keep setting you up for the next one.

What you can do at home

• Keep moving gently from the first day: short walks every hour or two
• Use heat (a hot water bottle or warm bath) for 15–20 minutes to relax the spasm
• Avoid bed rest beyond a day; when lying down, bend your knees over a pillow
• Get out of bed by rolling onto your side and pushing up with your arms
• Avoid heavy lifting and twisting for the first couple of weeks, then reintroduce gradually
• Your GP or pharmacist can advise on short-term pain relief if needed