Children’s calf pain may be growing pains, but also may be flat feet, hypocalcemia and other diseases. 1. Growing pains: mostly occurring in children aged 2 to 12 years old, the cause of this disease is not yet clear, may be related to the function of bone metabolism, psychological factors, limb activities, etc., the main symptom is the pain in the lower limbs, so the child’s calf pain may be growing pains. 2. Flat feet: the congenital factors of this disease are related to heredity and abnormal bone structure, while the acquired factors are related to tibialis posterior tendon insufficiency, bone ligament injury, neuromuscular pathology, etc. Some children are asymptomatic. Some children are asymptomatic, but those with symptoms may have pain in the middle of the foot, which may extend to the ankle and the inner side of the calf, and may be accompanied by ankle joint swelling and other symptoms. 3. Hypocalcemia: The causes of this disease include hypothyroidism and vitamin D deficiency. As some children suffering from hypocalcemia will have sensory abnormalities, they will have symptoms such as numbness and tingling in the hands and feet, which can be manifested as calf pain. There are many causes of calf pain in children, and they should go to the hospital for a complete examination to clarify the cause.