15yr dd has pain spot at s1 between abdomen and spine. pain is constant 16 months. ortho says nothing wrong. pain increase pushing abdomen. now what.

Primary care doctor.: If there is abdominal pain that increases with pressure on the abdomen, rather than an orthopedist who deals with bones, I would suggest you start by having your daughter seen by her primary care doctor for an exam. Keep a diary of any associated symptoms to review at that appointment and determine next best step.

Medical checkup: It is possible that it is not musculoskeletal. If you have had an MRI that is normal, consider a followup with your primary care doctor to look for non musculoskeletal causes of your pain.