There are several possible causes of painful leg cramps: First, when you catch a cold, there will be tonic spasms of the leg muscles and pain in the legs. This time to get out of the cold environment for hot compresses or heat therapy, for the recovery of leg cramps after the cold has a very good help effect. Second, lack of calcium, lack of calcium muscle will appear convulsions, this will also appear leg cramps pain symptoms. This is the time to carry out treatment such as calcium supplementation, at the same time to carry out blood tests, can also identify the cause of calcium deficiency, whether it is the endocrine system diseases that lead to calcium deficiency leg cramps. Third, neurological diseases, if the head of the central nervous system disease and lead to convulsions, pain, then to carry out the relevant auxiliary examination to further confirm the diagnosis and treatment.