A muscle strain happens when muscle fibers or a tendon are overstretched or torn. It may occur suddenly during sport, lifting or a fall, or develop gradually through repeated overload. Most mild strains recover with appropriate self-care and gradual return to movement.
Symptoms
Symptoms can include:
- pain and tenderness at the injured area
- pain when the muscle is used or stretched
- swelling or bruising
- muscle spasm or cramping
- weakness and reduced movement
A mild strain involves a small number of fibers. A severe strain can be a partial or complete tear and may cause a sudden snapping sensation, marked bruising, a visible gap or loss of function.
Muscle strain or sprain?
A strain affects muscle or tendon, while a sprain affects a ligament that supports a joint. Symptoms overlap, and a fracture, tendon rupture or joint injury can sometimes look similar. Significant injuries may need examination and imaging.
What to do during the first few days
- Protect: stop the activity and protect the injured area from further strain.
- Relative rest: reduce painful activity, but avoid prolonged complete inactivity unless advised.
- Ice: apply a cold pack wrapped in cloth for up to 20 minutes every 2 to 3 hours.
- Compression: a light elastic bandage may limit swelling if it is comfortable and does not affect circulation.
- Elevation: raise an injured limb when possible.
Remove compression and seek advice if the area becomes numb, cold, blue or increasingly painful. Avoid putting ice directly on the skin. Heat, alcohol and vigorous massage can increase swelling during the first couple of days.
Pain relief and recovery
A pharmacist can recommend suitable pain relief. Anti-inflammatory medications are not appropriate for everyone, including some people with kidney disease, stomach ulcers, asthma, pregnancy or blood-thinning treatment.
As pain and swelling settle, gentle movement helps prevent stiffness. Strength and flexibility should be rebuilt gradually. Return to sport only when movement is comfortable and strength is close to the uninjured side. Returning too early increases the risk of another strain.
Physical therapy may help after a moderate or severe injury, repeated strains or slow recovery. Back muscle symptoms may need different advice; see Lower Back Pain for warning signs and self-care.
When to seek medical advice
Arrange an assessment if pain is severe or worsening, swelling or bruising is extensive, you cannot use the limb or bear weight, there was a snap or visible deformity, or the injury is not improving with self-care.
Seek urgent help if the limb becomes cold, pale, blue or numb, there is uncontrolled bleeding, a bone may be broken, or a joint looks out of place. Sudden extreme pain with a tight swollen muscle, weakness or altered sensation may indicate acute compartment syndrome and requires emergency care.
Preventing another strain
Build activity gradually, warm up for demanding exercise, use appropriate technique and equipment, and allow recovery between hard sessions. Strength, flexibility and conditioning should match the activity. Previous injury is a risk factor, so complete rehabilitation before returning to full intensity.
Sources
Reviewed: 28 August 2026
Medical disclaimer: This information is general and does not replace examination, diagnosis or treatment by a qualified healthcare professional.