Pain at the junction of the hip bone and thigh is usually referred to as hip pain. Hip pain may be related to physiological factors such as excessive weight, or it may be related to hip synovitis, femoral head necrosis, bone fracture and bone tumor. 1. Physiological factors: for their own body weight is too large, large amount of movement of the population, may also appear hip pain, daily attention to reasonable exercise, avoid bad sports posture can be. 2. Hip synovitis: for young patients, the cause of hip pain is unknown, may be related to trauma or sports injuries caused by hip synovitis, in the local inflammation stimulation of the pain. 3. Necrosis of the femoral head: For middle-aged and elderly patients, especially those with a history of femoral neck fracture or long-term alcohol consumption and long-term oral glucocorticoid medication, it is necessary to first rule out necrosis of the femoral head, which is a common cause of hip pain. 4. Fractures: Fractures around the hip joint, such as acetabular fractures and fractures of the greater trochanter of the femur, can cause pain in the hip bone and thigh joint. 5. Bone tumors: Metastatic cancer and bone tumors can develop in tissues such as the acetabulum and femoral neck within the hip joint, causing pain at the hip and thigh joints. There are more causes of hip joint pain, so you should seek medical treatment when necessary to avoid delaying your condition.