Leg cramps in eight year olds are not necessarily caused by calcium deficiency, and calcium supplements are not currently recommended as a calcium supplement option for healthy children; increased intake of milk and milk products is recommended. The common causes of leg cramps, also known as painful leg cramps, include low blood calcium, neurological disorders, metabolism-related disorders, anatomical abnormalities of the legs, and improper posture. Therefore, leg cramps are not a direct diagnosis of calcium deficiency and require specialist care to determine the specific cause of leg cramps and to provide appropriate treatment. Calcium supplements are not recommended for healthy children because of their low bioavailability. 8 year olds can meet their daily calcium needs with adequate milk or yogurt intake, vitamin D supplementation to aid in calcium absorption, a balanced and healthy diet, and adequate aerobic exercise. Excessive calcium supplementation will also increase the risk of kidney stones and affect the absorption of other nutrients. Therefore, eight-year-old children with leg cramps, parents are advised to take their children to the hospital in a timely manner to clarify the cause and follow the doctor’s instructions for targeted treatment. Drugs need to be used under the guidance of a doctor.