Children in the process of growth sometimes appear children walk with a limp without pain, so what is the cause? The following reasons can be considered: 1. It may belong to growing pains: this happens mostly because the child’s activity is relatively large, the growth of long bones is faster, and the growth and development of local muscles and tendons are not coordinated, resulting in the occurrence of physiological pain. Growing pains usually do not require special treatment. The child should be given a joint x-ray to determine if there are any abnormalities, and a blood calcium level check to see if it is low. If the activity is normal, walking abnormality is mostly considered to be related to calcium deficiency. 2, may be hip synovitis: is caused by viral infection, mainly manifested as walking with a limp symptoms. This disease is generally self-healing, during the onset of the disease, it is recommended that joint braking, reduce the amount of activity, so as not to aggravate the wear and tear of the joint, with oral antiviral drug treatment. 3, may have to consider whether due to hip developmental deformity: congenital hip dysplasia caused. It is recommended to go to a regular hospital to see an orthopedic surgeon to improve the relevant examination, such as the DR examination of the hip joint to identify the cause, the doctor will determine the treatment plan according to the situation. 4, do a CT examination of the brain: to see if there is a brain disease caused by a limp on one side of the body.