Soreness of the right femoral head when lying on the side is considered to be related to physiological factors such as weight-bearing and exertion, and may also be related to pathologic factors such as osteoarthritis of the hip and necrosis of the femoral head. Physiotherapy, medication, surgery and other methods can be used according to the cause of the disease. 1. Physiological factors: due to long time walking, running or weight bearing, it can cause fatigue of soft tissues around the hip joint, excessive friction of joints, which can cause soreness and swelling at the right femoral head, bed rest, reduce weight bearing, which can be gradually relieved. 2. Hip arthritis: arthritic reaction caused by trauma or joint degeneration, may appear hip joint soreness, pain and other symptoms. Excessive activities should be avoided, and non-steroidal drugs such as diclofenac sodium and ibuprofen can be taken orally to relieve the local pain, and can also be combined with physical therapy such as heat therapy and microwave. 3. Necrosis of the femoral head: mostly due to trauma, alcoholism, long-term use of hormones and other reasons, usually to ban smoking and alcohol, avoid excessive use of joints, can be applied to diclofenac sodium and other drugs to ease the pain, the development of the disease in the late stage, the feasibility of artificial joint replacement surgery and other surgical methods of treatment. Lying on the side of the right femoral head soreness and other causes, it is recommended that patients go to the hospital to further identify the cause of the disease, and then targeted treatment. The above drugs need to be applied under the guidance of a physician.