Left hip pain how to: a, is the hip joint osteoarthritis. Due to degenerative changes and damage to the hip joint cartilage, clinical manifestations of joint pain and inflexible activities. The primary cause is aging, secondary cause is long-term unreasonable posture and movement, congenital joint development abnormality, trauma and drugs. Ischemic necrosis of femoral head. It is a common intractable disease in orthopedics, which also causes hip pain. Third, lumbar disc herniation is also prone to cause hip bone pain. It is usually seen in young adults, heavy manual laborers and long time sitting and standing workers. Fourth, strong spondylitis. Its early symptoms manifested as lower back and hip pain, joint stiffness. The pain is often aggravated during rest and inactivity, accompanied by morning stiffness in the hip joints and sacroiliac joints, commonly seen in young and middle-aged men.