Causes of convulsions include epilepsy, cold stimulation, calcium deficiency, over fatigue and nerve damage. 1. Epilepsy: Abnormal over-discharge of neurons in the brain leads to epileptic seizure, which will cause localized convulsions of the body or generalized convulsions, as well as impaired consciousness, foaming at the mouth, and incontinence. 2. Cold stimulation: when the ambient temperature is too low, or when there is cold stimulation such as cold wind, rain or snow, the body loses heat excessively, and the blood vessels and muscles of the localized body or the whole body undergo continuous contraction, causing convulsions. 3. Calcium deficiency: excessive loss or insufficient replenishment of calcium in the body leads to increased neuromuscular excitability and involuntary neuromuscular contraction, causing convulsions. 4. Excessive fatigue: Prolonged strenuous exercise or maintaining the same position for too long will cause excessive neuromuscular fatigue, which may lead to convulsions. 5. Nerve damage: damage to motor nerves leads to abnormal nerve function, resulting in involuntary contraction or spasm of the innervated part of the muscles, causing convulsions. Convulsions may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.