A hamstring injury typically causes a sudden, sharp pain in the back of the thigh. There might also be a "popping" or tearing sensation. Swelling and tenderness usually develop within a few hours. There might be bruising or a change in skin color along the back of the leg. Some people have muscle weakness or are not able to put weight on the injured leg.
hamstring injury typically causes sudden  sharp pain back thigh  "popping" tearing sensation  swelling tenderness develop hours  bruising change skin color back leg  people muscle weakness able put weight injured leg
hamstring injury