Thigh Pain Causes More Condition_symptoms What Causes Pain In The Back Of One Thigh (exclusively)?

What causes pain in the back of one thigh (exclusively)? - thigh pain causes more condition_symptoms

Today, while walking to a bus stop, suddenly had a terrible pain in the back of the left thigh. Nowhere. I have no idea what it is, it could be a problem, muscles or nerves likelly. Now I go in a strange way, and I know what it is. When I go to the ball of my meal) on foot to the left (near the feet, I have a terrible, hard, like a stabbing pain. I am a 17-year-old who had never been health problems. What is fever?