1, rheumatic fever: easy to cause pain in the ankle, knee, hip, wrist, elbow, shoulder and other large joints, that is, rheumatoid arthritis, can be accompanied by different degrees of joint swelling and pressure pain. The pain is short-lived, some only 1~2 days that is receding. If parents show to pay attention, rheumatic fever can be lesions spread to the heart, causing rheumatic heart disease. 2, rheumatoid arthritis: most of the onset of 4 to 10 years old, the disease can be acute, accompanied by fever, joint pain and other symptoms; can also be chronic. This disease can suddenly fever and accelerate the disease process, and eventually invade the whole body joints, resulting in joint deformities. 3, allergic purpura arthritis: clinical common one or more joint swelling and pain, while the skin purpura, a few with the same from time to time, so it is easy to be ignored, if not timely treatment, can lead to kidney damage. 4, acute septic arthritis: most often seen in infants and young children, sometimes secondary to injury or other infectious diseases. The onset of the disease is rapid, with one or more joints red, swollen and painful, accompanied by fever, irritability, loss of appetite and other signs. 5, acute hip synovitis: children are mostly 3~10 years old, often with a history of upper respiratory tract infection 2~3 weeks before the onset, mostly with mild pain in one thigh and knee joint as the main symptom, the pain increases when moving and can limp, and heals on its own after 3~4 weeks. 6.Other: autoimmune diseases such as systemic lupus erythematosus, mixed connective tissue disease, etc.; infections such as tuberculous osteoarthritis, etc.; some malignant diseases such as leukemia, etc., also have an incompatible relationship with joint pain. 7, growing pains: children grow rapidly in height during this period, and can grow 7-8 cm taller each year . Due to the rapid growth of bones, and its surrounding nerves, muscle health, muscle growth is relatively slow, and therefore will produce pulling pain. In conclusion, joint pain in children should not be ignored, and growing pains should be considered only after disease has been ruled out. Most of the growing pains are related to insufficient calcium intake in the diet, and the symptoms are often relieved with calcium supplements.