The symptoms of leg cramps at night in a 15-year-old child: 1, may be due to too strenuous activities during the day, too tired or walking for a long time, resulting in cramps at night when sleeping with a cold; 2, may be the 15-year-old child’s growth is too fast, caused by a lack of calcium. Therefore, the first thing you should do is to let your child avoid strenuous activities during the day when the symptoms of leg cramps at night appear. In the daily diet to avoid picky eating, partiality eating habits, diet should be balanced, appropriate attention to supplement the calcium content of higher food, such as milk, soybean milk, onions and so on. If necessary, calcium tablets or vitamin D3 can be supplemented to assist the absorption of calcium. If after the above symptomatic treatment, the symptoms of leg cramps at night did not get any improvement, must go to the regular hospital in time to improve the electromyography of the lower limbs and ionization examination, etc., to clarify the cause, and then choose further treatment measures, so that the symptoms of leg cramps at night to get timely and effective improvement.