Leg cramp, also known as muscle cramp occurs in the event of a leg muscles drastically contracting in a manner that one cannot avoid. This is accompanied by an acute pain in the legs. Mostly, the muscles which are known to be affected by this condition are those that cross over two joints likes of knee, ankle or hip. Examples of these muscles are calf muscles which cross the knee and ankle, the quadriceps which crosses hip and knee, and the hamstring muscle which also crosses the hip and the knee.
Leg cramps are known to last only for about a minute with some more minutes taken before contraction gets back to normalcy. They are commonly known to occur at bedtimes awakening one from deep sleeps as they are extremely acute in an abrupt way.