Possibilities can include problems with the appendix, colitis, irritable bowel syndrome or inflammatory bowel disease.
Tests to consider would be an abdominal CT scan. This can evaluate for possible colits as well as the appendix.
If negative, the colonoscopy is a good idea.
If these tests are negative, irritable bowel syndrome can be considered - treatment can include increasing the fiber in the diet as well as antispasmodic agents.
The ovaries should also be considered - but this has already been evaluated via an ultrasound.
These options can be discussed with your personal physician.
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.
http://www.straightfromthedoc.com
Thank you
Dawn