Leg cramps occur frequently for the following reasons: First, the most common reason in the clinic is cramps caused by calcium deficiency. If a long time calcium deficiency, low blood calcium in the body will appear cramps, and the most likely part of the cramp is the rear of the calf, that is, the area of the gastrocnemius muscle. You should promptly go to the hospital for blood testing, if confirmed to have low blood calcium, timely and correct calcium supplementation, often cramping phenomenon can be significantly alleviated. Secondly, lumbar disc herniation compresses the nerve causing muscle cramps or radiating pain in the innervated area, which is the cramp phenomenon. For this situation, the correct treatment should be to actively improve the lumbar spine MRI examination to clarify the degree and location of the herniated disc, and choose the appropriate treatment plan for the condition. Usually, conservative treatment is available, but if the herniation is severe and the nerve compression is obvious, surgery may also be required.