Clinically there is no such thing as “cramps are a warning from the body”, so it is not true. Cramps are mainly related to physiological factors, calcium deficiency, epilepsy and tetanus. 1. Physiological factors When the patient carries out a lot of activities, it can lead to muscle fatigue of the lower limbs and accumulation of lactic acid, which can be manifested as cramps and convulsions. 2. Disease factors (1) Calcium deficiency: When there is a serious lack of calcium ions in the body, muscle spasms can occur, and patients can experience cramps and twitching. Combine with electrolytes and other tests to confirm the diagnosis. (2) Epilepsy: This disease is caused by highly synchronized abnormal discharges of neurons in the brain, and the onset of the disease will be accompanied by convulsions of the limbs. Diagnosis is confirmed by cranial MRI and EEG. (3) Tetanus: This is an acute infectious disease caused by the bacterium Clostridium tetani, and the onset of the disease is characterized by symptoms such as corns and cramps. Cramps may also be caused by other reasons. If cramping occurs or the condition gradually worsens, you should consult a doctor or call the emergency center (120) for help, and cooperate with the doctor for rescue treatment.