Body cramps are caused by several mechanisms: First, they may be caused by electrolyte disorders. For example, a large amount of vomiting, diarrhea, and sweating in the human body in a short period of time may cause the body to lose a large amount of electrolytes. At this time will cause electrolyte disorders in the internal environment, so that the muscles produce twitching. Second, it may be caused by cold. Such cramps are seen in the extremities, such as the extremities in contact with cool objects, or after being blown by the cool wind, it is easy to produce muscle spasms, resulting in cramps. Third, it may be caused by overexertion. Patients do excessive exercise or labor, easily causing fatigue in the muscles of the whole body. When the patient rests or continues to barely move, it may make the muscle spasm. Fourth, it may be caused by abnormal discharge of the brain. For example, when a patient has epilepsy, the brain produces an abnormal discharge, which can cause the muscles around the body to produce involuntary and continuous convulsions.