Foot pain in 5-year-old children may be related to lactic acid accumulation, nutritional element deficiency, plantar fasciitis and so on. 1. Lactic acid accumulation: it may be that the child is over-exercising, the body produces a large amount of lactic acid, the body can not be metabolized in time, resulting in soreness in the feet. 2. Nutrient deficiency: It may be that the growth of children is too fast, or the diet is not balanced, causing different degrees of zinc and calcium deficiency, leading to episodes of musculoskeletal pain in children. 3. Plantar fasciitis: excessive exercise may cause fascial strain or excessive stretching of the foot, causing aseptic inflammation, which can also lead to foot pain. Foot pain in 5-year-old children can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions to carry out relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.