Repeating the endoscopy can be considered to further evaluate for an ulcer, or inflammation of the upper GI tract.
If gallbladder disease is of concern, an ultrasound or CT scan can be considered.
If the tests remain negative, more specialized tests like a 24-hr pH study can be done (which would definitively rule out GERD). Blood tests for celiac disease also be considered.
If the GI workup continues to be negative, optimizing treatment for costochondritis can be done.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_