| What We Treat
Muscle Strains
Felt something pull mid-movement? Muscle strains heal reliably — but how you load them in the first weeks determines how fast you recover and how likely it is to happen again.
Overview
What Is a Muscle Strain?
A muscle strain is a tearing of muscle fibres when the load applied exceeds what the tissue can tolerate. They occur most often when a muscle is contracting while lengthening, which is why sprinting, kicking, decelerating and catching a heavy object are the classic mechanisms. Muscle has an excellent blood supply and heals reliably. The variable is whether rehabilitation restores full strength at length — because that determines re-injury risk.
Grade I — Mild
A small proportion of fibres overstretched. Localised pain and tenderness, but strength largely preserved and movement possible. Responds to a few days of relative rest followed by graded loading, with return to sport typically within one to two weeks.
Symptoms
How It Tends to Feel
Strains usually declare themselves at the moment they happen:
A Sudden Pull or Grab
A sharp sensation at a specific point during a specific movement, usually forcing you to stop.
Localised Tenderness
A specific tender area over the muscle, which helps establish which muscle and where.
Pain on Resisted Movement
Contracting the muscle against resistance reliably reproduces the pain — a key diagnostic feature.
Pain on Stretch
Lengthening the affected muscle reproduces symptoms, particularly in the first days.
Bruising
Appearing over one to three days and often tracking downwards with gravity.
Weakness
The degree of weakness broadly reflects the grade and helps set expectations for the timeline.
Causes & Risk Factors
What Drives It
Strains reflect a mismatch between the demand placed on a muscle and its capacity at that moment.
Eccentric Load
Contracting while lengthening — decelerating, landing, catching a load — is when most strains occur.
Insufficient Strength at Length
Muscles that are strong in the middle of their range but weak when lengthened are particularly vulnerable.
Fatigue
Strains cluster late in matches, sessions and seasons, when neuromuscular control declines.
Previous Strain
The strongest single predictor of another strain, usually because strength deficits persisted after return.
Sudden Increases in Load
A step up in training intensity, particularly involving sprinting or explosive work, is a common precipitant.
How We Can Help You
Treatment & Management
The principles are the same across muscle groups: start loading early, progress into lengthened positions, and finish the programme rather than stopping when pain resolves.
What the evidence says
The best-developed evidence base is in hamstring injury, where trials show early controlled loading leads to faster return to sport without increased re-injury, and where lengthened-position eccentric strengthening substantially reduces recurrence. These principles have been extended across muscle groups.
Re-injury rates after muscle strain are consistently highest in the first two weeks after return to sport, and are strongly associated with persisting strength deficits — which is why criteria-based return matters more than a calendar date.
When to Seek Help
Red Flags — Don’t Ignore These
Muscle strains are benign. These features suggest a more significant injury:
⚠ Seek prompt medical assessment if you notice:
- A pop with a palpable gap, marked weakness and a visible change in muscle shape (possible complete tear or avulsion)
- Severe pain with a tight, hard, swollen limb and numbness (possible compartment syndrome — attend A&E)
- Extensive bruising with feeling faint or unwell (possible significant bleeding)
- Calf or thigh swelling with warmth or redness (possible clot — seek same-day assessment)
- Muscle pain without any clear mechanism, particularly with dark urine or feeling unwell
These symptoms need same-day medical assessment. Please contact your GP or NHS 111 today, or attend A&E if they are severe or worsening quickly.
Common Questions
Frequently Asked Questions
Should I rest it?
Only briefly. A few days of relative rest is reasonable, but early graded loading produces faster recovery than waiting for pain to resolve. Muscle heals better under controlled load, and prolonged rest costs strength you then have to rebuild.
Should I stretch it?
Not aggressively in the first week or two. Stretching a healing muscle hard can worsen the injury. Gentle range work is fine; progressive strengthening through lengthened positions is what actually restores tolerance to length.
When can I go back to sport?
When strength is symmetrical, you can perform the demands of your sport without pain, and you’ve rehearsed the specific movement that injured you. Re-injury risk is highest in the first two weeks back, so a graded return matters.
Do I need a scan?
Usually not. Most strains are diagnosed clinically and managed the same way regardless of exact grade. Imaging becomes useful where a complete tear or avulsion is suspected, or in an athlete where precise timelines matter.
Load It Back Properly
An accurate grading, an early and progressive loading plan, and return criteria that reduce the chance of a repeat.
Book Your Initial AssessmentThis page is for general information only and isn’t a substitute for individual medical advice. If you’re experiencing any of the warning signs above, contact your GP or seek emergency medical care as appropriate.