If you wake up with shoulder pain, most of the symptoms are caused by the following reasons: 1. The most common reason for shoulder pain after waking up is poor sleeping posture. If you sleep in a position that excessively stretches, stretches or rotates the shoulder joint, you will definitely damage the soft tissues around the shoulder joint during long hours of sleep. If the quality of sleep is good, the degree of damage will be more serious and the symptoms of soreness will be more obvious, but most of the soreness caused by this condition is short-lived and the symptoms will disappear completely after 1-2 days. 2. Some patients who suffer from cervical spondylosis usually have the habit of lowering their heads for a long time, and the height of the pillow used when sleeping is not suitable, which is likely to aggravate the cervical spondylosis and stimulate it. It is possible to aggravate the cervical spondylosis and stimulate the cervical nerve to produce the symptoms of shoulder pain and discomfort.