A fourteen-year-old child’s leg cramps are considered to be caused by muscle spasms, calcium deficiency and other reasons. 1. Muscle spasm: if the fourteen-year-old child leg injury or long time excessive exercise, so that the body of the muscle excessive tension spasm, which led to the symptoms of fourteen-year-old child leg cramps. 2. lack of calcium: children in the growth and development period, the metabolic rate is faster, when the body of calcium elements in the lack of, will make the leg muscle spasm, contraction and other phenomena, which is manifested as a fourteen year old child foot cramps symptoms. Caused by fourteen-year-old children leg cramps more causes, when the body symptoms, it is recommended to go to the hospital in a timely manner to conduct relevant examinations, clear causes, as soon as possible for targeted treatment.