Back pain when turning over may be caused by fracture, muscle strain, frozen shoulder and other conditions. 1. Trauma: Usually the patient’s back is hit or squeezed by external force, resulting in local trauma, pain, swelling and other symptoms often occur, and the patient can also appear back pain when turning over. 2. Muscle strain: It is usually caused by direct traction on the muscles, and muscle strain can be induced by not warming up properly before exercise, fatigue, and repetition of the same action. Patients often experience symptoms such as muscle pain, skin bruising or swelling, and limited movement of the injured area. Therefore, patients with back injuries may also feel pain when turning over. 3. Frozen shoulder: the cause of this disease is not clear, may be synovitis and joint capsule fibrosis together. Patients often have pain around the shoulder joint, limited activities and other symptoms, with the development of the disease, patients also feel stiffness in the shoulder joint, and some patients may also have pain when they turn over in the back. It is recommended that patients should consult a doctor for a clear diagnosis and follow the doctor’s instructions when they experience pain when they turn over.