57 female.middle back pain, maybe after eating greasy food.chest x-ray, blood test , gallbladder normal. is it a muscle ?also belches

Abdominal Pain: This might be related to the pancreas. As with most pain conditions, there can be a variety of potential problems that can cause the pain that you are describing. It is difficult to diagnose with the short description given and without a proper physical examination. Pain is often a sign of inflammation. A qualified specialist should be consulted.