Pain in the groin area and sacroiliac joint area may be related to joint degeneration, or it may be caused by sacroiliac arthritis, femoral head necrosis and other reasons. 1. Joint degeneration: common in the elderly, along with the gradual increase in age, the function of many parts of the body are gradually undergoing degeneration, due to the degeneration of the cartilage of the groin and sacroiliac joints, which may cause pain in the groin area and sacroiliac joint area. 2. Sacroiliac arthritis: this disease is usually caused by bacterial infection, immune factors, etc., which can lead to inflammatory reaction of the sacroiliac joints, under the stimulation of inflammation, it may cause pain in the sacroiliac joints area, and may be accompanied by radiating pain, which may cause pain in the groin area. 3. Necrosis of the femoral head: Usually, the blood supply to the femoral head is damaged or interrupted, leading to the death of bone marrow components and bone cells, resulting in the collapse of the femoral head, which may cause pain in the inguinal region and the sacroiliac joints, and may be accompanied by pain in the hip on the affected side, inactivity and other manifestations. Pain in the groin area and sacroiliac joint area may also be caused by other reasons. If the symptoms are serious, one should consult a doctor as soon as possible to confirm the diagnosis and give targeted treatment.