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What is hamstring strain?
A hamstring strain is a muscle injury at the back of the thigh, usually during sprinting, rapid acceleration, or forced lengthening. Location and severity affect the rehabilitation timeline and reinjury risk.
The same label can behave differently from one person to the next. The timing, location, type of symptoms, injury mechanism, and response to movement help distinguish a local tissue problem from referred pain, nerve involvement, or a pattern that should be evaluated elsewhere first.
Common signs of hamstring strain
People do not need every sign below to fit this pattern. They are useful clues to discuss during an evaluation, especially when paired with what changes the symptom and what activity has become difficult.
- sudden back-of-thigh pain
- pain running fast
- bruising in higher-grade injury
- pain with resisted knee bend
What may be loading the area
A contributor is not always a single cause. Tissue capacity, recovery, the size of a recent load change, and the mechanics of the task can overlap. For hamstring strain, the history commonly examines:
- 1max-speed sprinting
- 2fatigue or exposure gap
- 3forced stretch
What a useful assessment should answer
An assessment begins with the story, then tests the findings that can change a decision. For this presentation, that usually means looking at the items below and comparing them with the demands of work, daily life, or sport.
Imaging can be useful when the history or examination indicates it, but a scan is not a substitute for matching the finding to symptoms, function, and the clinical screen.
Clinically reviewed
Reviewed by Dr. Tamara Lovelace, DC, DACBSP, ICCSP, Chiropractic Sports Doctor and clinic director, on August 25, 2026.
This page explains what we look at and what care can involve. It is not a diagnosis, and it cannot replace an examination. Bring the problem in and a provider will tell you what is going on.
