Leg cramps may be caused by abnormal calcium and phosphorus metabolism due to vitamin D deficiency, in addition, strenuous exercise may also cause leg cramps. 1. Vitamin D deficiency: leg cramps are mainly caused by the lack of calcium in the patient’s body, usually associated with vitamin D deficiency in the patient’s body, resulting in abnormal metabolism of phosphorus and calcium in the body, thus affecting bone development and growth. Vitamin D deficiency in the patient’s body will cause vitamin D deficiency tetany, the patient will have convulsions, muscle twitching in the hands and feet, laryngeal spasms and other manifestations, which will be manifested as leg cramps. 2. Strenuous exercise: Prolonged strenuous exercise may lead to leg muscle spasms, which can also cause symptoms of leg cramps. Patients with leg cramps need to consult a doctor in time to check the cause of the disease, and take appropriate measures to treat the cause of the disease. For leg cramps caused by calcium deficiency, calcium supplements such as 10% calcium gluconate and 10% calcium chloride should be taken under doctor’s supervision. At the same time, it is also necessary to follow the doctor’s advice to supplement vitamin D.