Can you tell me how to diagnose my hamstring area pain?

Hamstring pain: Mild hamstring strains may not hurt too much. But severe ones can be agonizing, making it impossible to walk or even stand. Other possible symptoms of a hamstring strain are: 1) sudden and severe pain during exercise, along with a snapping or popping feeling. 2) pain in the back of the thigh and lower buttock when walking, straightening the leg, or bending over. 3) tenderness. 4) bruising.