Knee pain in 10-year-old children may be caused by physiological factors, or knee ligament injury, knee synovitis, etc.. 1. Physiological factors: 10 years old is the period of rapid growth and development of children, some children due to the growth and development of long bones too fast, and local muscle and tendon growth and development speed can not keep up, so there will be symptoms of growth pain, which can be manifested as pain in the knee. 2. Knee ligament injury: if the child’s sports are relatively more, but do not pay attention to self-protection, in the sports may cause the knee ligament injury, and then lead to knee pain, swelling symptoms. 3. knee synovitis: can be caused by knee injury or joint sprain, if the injury is not timely treatment, can cause synovial swelling, inflammation, and then cause knee pain. 10-year-old children’s knee pain, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.