WHY does a cramp occur?

WHY does a cramp occur? 

 

Cramps are especially common in the muscles of the foot, fingers and calves. Physiologically, a cramp is an abrupt contraction and spasm of muscles caused by circulatory disorders or physical exertion. 

 

A frequent cause of a cramp may be an abortive movement or monotonous repetitive motion. Such cramps develop in people typing a lot on a PC or playing with a computer mouse, working on their feet, or exercising intensively. 

 

Leg cramps are frequently caused by a lack of calcium and potassium salts in the body. This often occurs with intense exercise, taking diuretics, and dehydration.