Leg cramps, also called muscle spasms, cannot be caused by drinking alcohol alone. Basically, it may be due to the dilation of blood vessels after drinking alcohol, and then the body heat, plus the patient sleeps at night, the legs are exposed for a long time, long time blowing air conditioning, blowing fans, resulting in the leg muscles are stimulated by wind and cold. After being stimulated by wind and cold, the muscles continue to be tense, blood circulation slows down and venous return decreases, thus producing the metabolite lactic acid, which is not discharged in time and triggers leg cramps in patients. Another condition may also be due to heavy exercise during the day, as well as a large amount of activity, the body lost more salt and water, and failed to timely replenish and induced leg cramps.