The common causes of leg cramps in adolescence are as follows: 1, muscle spasm: the body for a long time, a large number of movements lead to leg cramps, so it is recommended that adolescents appropriate exercise; 2, lack of calcium: the lack of calcium in the blood during sleep leads to elevated muscle activity, the muscles are in a state of sustained activity, the emergence of leg cramps. It is recommended to strengthen the diet, such as eating more milk, eggs, soy products and shrimp and other calcium food. Most of the calcium in the body is taken in through food, so three meals a day need to be standardized for adolescents. Secondly, exercise, especially outdoor exercise, can increase the intake of vitamin D, which is conducive to the absorption of calcium, as well as maintaining normal muscle activity. Therefore, adolescents are advised to eat a balanced diet along with appropriate exercise. Calcium content within each person’s bone begins to reserve at puberty, and an abundance of bone in the body at puberty can reduce the incidence of osteoporosis in old age, or else it can increase the incidence of osteoporosis, so it is necessary to pay attention to the bone health of adolescents.