Chest and back pain in the morning and no pain during the day may be related to improper sleeping position at night, or it may be caused by ankylosing spondylitis and thoracic back fasciitis. 1. Improper sleeping position at night: During the night sleeping process, if you keep the improper sleeping position for a long time, it will easily lead to neck and back muscle tension, stiffness, spasm, and you may get up in the morning with chest and back pain, but no pain in the daytime. 2. Ankylosing spondylitis: the disease is a chronic inflammatory disease, can violate the spine, peripheral joints, sacroiliac joints and other parts of the spine, which may lead to chest and back pain in the morning, but not during the day, but also may be accompanied by hip pain, low back pain, and stiffness of the waist in the morning and other manifestations. 3. Thoracic dorsal fasciitis: usually caused by long-term chronic strain, or staying in a wet, cold environment for a long time, which can lead to aseptic inflammation of the thoracic dorsal fascia, which may cause chest and back pain in the morning, but not during the day. Chest and back pain in the morning, but not during the day, may be caused by other reasons, if the change of improper sleeping position, the symptoms still frequent, should be early to consult a doctor, a clear diagnosis of the cause, the doctor guided by the treatment.