Hamstring strain
Also called: pulled hamstring, hamstring tear, hamstring injury, torn hamstring. Clinical name: Hamstring muscle strain (biceps femoris, semitendinosus, semimembranosus).
Mild hamstring strains usually settle in 1–3 weeks, moderate tears take 3–8 weeks, and severe tears can need 3 months or more. The biggest risk is returning to sprinting too early and re-tearing it.
What it actually is
A hamstring strain is a tear in one of the three muscles that run down the back of your thigh, and it is the classic sprinter’s injury: a sudden sharp grab mid-acceleration, mid-kick, or in a deep stretch. The hamstrings work hardest when they are lengthening at speed, which is exactly when they fail. That is why the injury so often happens at the worst possible moment, at full pace, chasing a ball.
Severity is everything with hamstrings. A mild strain is a few overstretched fibres and a couple of weeks of care. A complete tear is a different injury altogether, with months of rehab and occasionally surgery. Most fall in the middle: a partial tear that is sore for a few days, bruises impressively, and then spends several weeks tolerating steadily more work. The bruise sliding down towards the knee can look alarming but is normal; blood follows gravity.
What makes hamstrings notorious is not the first injury but the second. Re-injury rates are among the highest of any muscle strain, and the story is almost always the same: it felt fine at a jog, so the sprinting started early, and it went again, worse. The fix is a boringly gradual return, walk, jog, stride, sprint, with strength work that continues long after you are back playing.
How bad is it?
Injuries like this are usually described in grades. The grade is what shapes your timeline and what you can safely do while it settles.
A few overstretched fibres. Tightness or a twinge at the back of the thigh; you can usually still walk and jog lightly. Sprinting is what it will complain about.
A partial tear. Sudden sharp pain mid-sprint or mid-stretch, often with swelling or bruising a day or two later. Walking may be uncomfortable at first, and sprinting is off the table for a while.
A complete or near-complete tear, sometimes off the bone. A pop you feel or hear, difficulty walking, and significant bruising. Needs a clinician early, and occasionally surgery.
How long will it take?
Recovery moves in phases. This is the typical shape of it — yours may run faster or slower, and the numbers below are general ranges, not a forecast for your specific injury.
When to get it looked at
Most cases settle with time and sensible loading. Get it assessed by a professional if any of these apply — they can point to something that needs hands-on care:
- A pop or snap at the moment of injury with immediate difficulty walking
- Massive bruising spreading down the back of the thigh within a day or two
- A visible lump or gap in the muscle, or pain high up under the sit bone (in younger athletes this can be an avulsion, where the tendon pulls off the bone)
- Numbness, tingling or weakness below the knee
- Pain that is not clearly improving after two to three weeks of sensible rest and rehab
This is a list of warning signs, not a diagnosis. If you are worried, or the pain is severe, see a GP, physiotherapist or urgent care.
What to track while you recover
Hamstring recoveries fail in a predictable way: things feel fine at a jog, so you sprint, and it goes again. A daily record of pain and what speed you ran at is the cheapest insurance against that second, usually worse, strain.
- Pain score today, 0–10, at rest and at your fastest run of the day
- The fastest thing your leg did today: walk, jog, stride, sprint, and how it felt
- Tightness or a sense of the hamstring guarding, even without pain
- Any bruising or swelling changes
- Strength sessions done, especially lengthening work like Nordic curls or Romanian deadlifts
This is exactly what InjuryLog does.
Log each of these in seconds, watch the trend build day by day, and keep every scan and receipt tied to this one injury. Free on iOS, Android soon.
Wondering how long yours will take? Try the free recovery time estimator for a typical, phased timeline by injury and severity.
What to tell your physio
A physio treating a hamstring wants the story of the moment it happened and the trend since, both much easier to give from a record than from memory.
- Exactly how it happened: sprinting, stretching, or gradual tightening, and whether you felt a pop
- Whether you could keep playing or had to stop immediately (a strong severity clue)
- How far along you are: current pain, fastest comfortable running speed, and any setbacks
- Previous hamstring injuries on either side; this is the biggest re-injury risk factor
- Your goal and timeline: what match, race or activity you are working back to
Walk in with the whole picture.
InjuryLog turns your daily logs into a clean Physio Visit Pack, a one-page summary your physio can actually read, so the first appointment starts with facts, not guesswork.
The questions people actually ask
How long does a hamstring strain take to heal?
It depends almost entirely on grade. A mild (grade 1) strain typically settles in one to three weeks, a moderate (grade 2) partial tear more like three to eight weeks, and a severe (grade 3) tear can take three months or longer, occasionally needing surgery. Age and history matter too: a previously torn hamstring tends to be slower and more nervous the second time. The honest range for most sporty adults with a grade 2 is about a month and a half.
What does a grade 2 hamstring tear feel like?
Usually a sudden sharp pain in the back of the thigh mid-sprint, mid-lunge or in a deep stretch, strong enough that you stop what you are doing. Walking is often uncomfortable for the first days, and bruising can appear lower down the leg a day or two later as blood tracks down. You will typically feel a specific tender spot in the muscle rather than general tightness, and trying to accelerate or kick will reproduce the pain sharply.
Can I run with a pulled hamstring?
Not at first, and not at speed. In the first days the aim is walking comfortably. From there most rehab plans reintroduce running in stages: easy jogging when walking is painless, then strides, then sprinting last, because sprinting is where the hamstring works hardest. Running through a fresh strain, or jumping straight back to full speed, is the classic way a two-week injury becomes a two-month one.
Should I stretch a pulled hamstring?
Not aggressively, and not early. A fresh strain is a torn muscle, and pulling it into a stretch stresses exactly the fibres that are trying to knit. Early on, gentle pain-free range of movement is enough. Later in rehab, exercises that load the hamstring while it lengthens (like Romanian deadlifts or Nordic curl progressions) do the job stretching is usually credited with, and the evidence for them in preventing re-injury is much stronger.
Why do hamstring injuries keep coming back?
Because the biggest risk factor for a hamstring strain is a previous one. Scar tissue, lost strength at long muscle lengths, and returning to sprinting before the muscle is ready all stack the odds, and re-injury rates are highest in the first weeks after return. The protective factors are unglamorous: finishing the strengthening work, building sprint speed gradually, and keeping hamstring exercises in your routine after you are back playing.
Do I need a scan for a hamstring strain?
Usually not. Most hamstring strains are diagnosed from the story and a physical exam, and a scan does not change the plan for the majority. Imaging (usually MRI or ultrasound) earns its place when a severe tear is suspected, when pain sits high up near the sit bone suggesting the tendon may have pulled off the bone, or when recovery is not following the expected path. If you do have a scan, keep the report; it is exactly the kind of document worth having on hand at appointments.
Sources
- Sports injuries — NHS
- Hamstring Muscle Injuries — AAOS OrthoInfo