Occasional leg pain may be caused by too much walking and fatigue, and proper rest is sufficient. However, if you have long-term leg pain, you need to be alert to aseptic necrosis of the femoral head, rheumatism, hip dislocation, tuberculosis hip arthritis and other diseases. 1. Aseptic necrosis of femoral head: aseptic necrosis of femoral head is mainly caused by ischemic necrosis of femoral head, which will cause soreness of the inner side of the knee joint, limping, shortening of the lower limbs and other symptoms. 2. Rheumatism: Rheumatism is mainly manifested by soreness of the joints of the limbs, most of them are accompanied by typical morning stiffness, the symptoms are more obvious when getting up in the morning, and they can be relieved after activities, which can be ruled out by checking the blood sedimentation, rheumatism factor, anti-nuclear antibody, and so on. 3. Hip dislocation: patients with hip dislocation will not only have unequal length of the lower limbs, but also have pain in the legs. 4. Tuberculous hip arthritis: patients with tuberculous hip joint will also have symptoms of leg pain on the affected side. 5. Other possible diseases: such as lumbar disc herniation, osteoporosis, lower limb arthritis, leg muscle strain, lower limb ligament injury and other diseases can also lead to leg pain symptoms. Long-term leg pain symptoms, it is recommended to go to the hospital in a timely manner for relevant examinations, to clarify the cause of the disease, targeted treatment.