Its impossible to diagnose your mother without seeing her. Osteoporosis does not cause pain unless there is a fracture. It is possible that she could have had a compression fracture at one of her vertebrae, with compression of a nerve causing pain to radiate into the abdominal area. Or her pain might be medication related.
About Alan Matsumoto, M.D.
Part-time Faculty, Division of Rheumatology
Johns Hopkins University