They are not injured, they are not sick, they eat, play and study as usual, and they do well in sports, but they often complain of leg pain. After a night’s rest, they went to school the next day as usual. In the past, they did not feel any discomfort in their legs, and there was no redness, swelling, heat or pain in any part of their legs, including the knee joint, thighs and calves. The actual meaning is that it is not a disease, but a common temporary phenomenon in the process of growth. Of course, it does not require treatment and will heal naturally in time. The medical term “growing pains” is not a disease name, but refers to a temporary leg pain symptom without clear pathological changes. The main reasons are: children grow fast, increase activity, increase the way of activity, but musculoskeletal development and functional cooperation cannot keep up with the needs, uneven exertion of various muscles, incomplete protection of each joint, and find certain muscles fatigue pain, or ligament pulling pain, joint pressure pain at night after resting. If there are some objective factors in growth and development, it will aggravate the occurrence of imbalance and maladjustment. For example, the most common condition is congenital inward curvature of the calf bone in children. This is a fetal position deformity. The fetus is born with an inward curvature of the tibia after the two calves are coiled in the mother’s womb. It can gradually become straight and takes about 5 to 6 years. However, at the age of one, the baby has to learn to walk, and the feet must be separated, which causes the knee to turn out, and pulls the knee ligaments loose, causing the focus to be wrong and the knee joint to be unstable. In order to walk steadily, the leg muscles have to exert more force, resulting in excessive fatigue. Sometimes there are abnormal strains and impacts on the knee joint, and it hurts at night, but it gets better after a night’s rest. In infants, there is not much movement and there are usually no symptoms. After preschool, the weight increases and the growth is at its peak, so the activity increases and the symptoms become obvious, even daily. Fetal position deformity is bilateral, but people are always used to exerting more force on one side, so they mostly see pain on one side of the leg. If one side is afraid to exert due to pain, the opposite side will also have pain. Until the leg muscles develop and develop, the pain disappears when the knee joint can be protected and stabilized without force. Also, as the muscles are pulled in balance, the bones are gradually straightened as they grow. In general, it is a growing process, hence the name growing pains. The above mentioned fetal tibial inversion is only one of the common causes of growing pains, and there are many other causes of growing pains. Poor motor habits and improper posture are also common causes, such as poor habitual gait or improper spinal posture (slanting backpack, scoliosis and hunchback in the sofa, etc.). Of course, there are also some real epiphyseal (raw bone line) lesions, serious ones such as femoral head necrosis within the hip, tibial nodal epiphysitis, heel epiphysitis, etc., all have bone lesions, but generally paying attention to protection, with the maturation of growth can also be self-healing, without any treatment, which of course requires medical guidance for protection. We can summarize the characteristics of growing pain as follows: 1. Normal general health and normal physical activity. The pain is mostly late afternoon to night, with no symptoms the next morning. May have prolonged episodes, but does not interfere with growth and development. Good motor ability. 2. There is no local redness, swelling, heat or pain in the painful area, and no pressure pain. There are no fixed pain points at all, that is, the child can not say which part of the pain. x-ray or other examinations without lesions. 3.Fat children, active children, fast growing children and those with heavy calf bending are more likely to have growing pains. Since growing pains are not a disease, it is not possible to talk about treatment. But what can parents do for their children when they are in pain? Should we limit the amount of exercise? First of all, parents should make sure that the child rests, and they can help the child to do leg massage. The specific practice is: massage from the foot up to the knee, massage the calf belly, and insist on doing it for ten minutes every night, and do it anytime when it hurts, which can accelerate blood circulation in the legs and reduce leg pain. As for the arrangement of the amount of exercise for children, our principle is: encourage exercise and avoid overwork. The purpose of encouraging exercise is to strengthen the leg muscles in order to gradually achieve the ability to keep the knee joint stable and balanced, so that the leg pain disappears. However, if the activity is too much and overworked, it is no longer able to support, but will aggravate the instability and produce pain. It even makes the joint and ligaments injured and becomes chronic strain. The consequences are quite serious and go far beyond growing pains. Even so, parents should not be overly distressed and pampered by their child and not allow him to exercise at all. The child’s sense of self-protection is reliable. In short, it is to help remove the objective factors that predispose to growing pains. As the muscles strengthen and stabilize the knee joint with age, the leg pain can gradually heal itself.