Morning back pain stomach pain may be caused by lumbar dorsal fasciitis, ankylosing spondylitis, urinary stones and other causes. 1. Lumbar dorsal fasciitis: it is a kind of sterile inflammation, under the stimulation of inflammation, the local tissues will be edema, compression of peripheral nerves will lead to low back pain, lumbar myofasciitis patients will be accompanied by autonomic dysfunction, which will lead to abdominal pain. 2. Ankylosing spondylitis: Ankylosing spondylitis is a kind of disease that mainly involves the middle-axis joints, and it occurs firstly in the sacroiliac joints, so most of the patients will have the first manifestation of the pain in the lower back, and it will be accompanied by autonomic dysfunction, which will lead to abdominal pain. 3. urinary stones: this is because of abdominal pain and lower back pain caused by dilatation of the ureter and fluid retention in the kidneys due to stones blocking the urinary system. If the symptoms of morning back pain and stomach pain persist without relief, you need to seek medical treatment.