Wake up sore back but not sore up may be bad sleeping posture and other physiological factors, may also be rheumatic immune diseases and other pathologic factors. 1. Physiological factors: If you sleep in an improper posture, or sleep in a bed that is too soft or too hard can lead to waking up sore, get up and move to relieve. 2. Pathological factors: if you wake up sore but not sour may also be rheumatoid arthritis and other rheumatic immune diseases caused by morning stiffness, patients will have localized soreness and swelling, but also spondylitis and other diseases caused by. Wake up sore back instead of more causes, may also be ankylosing spondylitis, it is recommended that patients exclude physiological factors, and actively seek medical treatment, so as not to delay the condition.