Clinically, cramps are not directly related to height growth and often suggest hypocalcemia, which can cause increased nerve and muscle excitability when hypocalcemia is present and can have clinical manifestations of cramps. Children or adolescents, because of the rapid growth of height, the demand for calcium increases significantly, often in the process of growth and development can appear the clinical manifestations of cramps. At this time, parents should pay attention to ensure that the child’s nutrition is balanced, taking calcium-rich dairy products, soy products and other foods, and supplementing with nuts in appropriate amounts to replenish calcium elements, and if necessary, calcium supplements need to be given. Increase outdoor activities and skin exposure to light to increase the synthesis of endogenous vitamin D, thus promoting calcium absorption and preventing growth and development leading to hypocalcemia and causing clinical symptoms such as convulsions.