Black stools indicate a problem with bleeding in the Stomach, Visible blood in the stools is a sign of bleeding further down in the intestines, Sence you have had an endoscopy they should show signs of an ulcer or something that would cause bleeding, When did the black stools start ? Has it always been black or was it after the endoscopy you noticed it? How frequently are they black ? Do you take Iron tablets or Pepto bismol as these can cause black stools ,I would say if the colonoscopy was clear then it's probably nothing like ulcerative colitis or Crohns .
The black stool only happened 2-3 times last week. The colonoscopy/endoscopy showed nothing more than minor erosion and a nodule that was tested and came back negative. I do not take Pepto (makes me puke :P ) and no iron. I have a HIDA scan next week. I'm just afraid no one will ever figure out what's wrong with me. Maybe it's all in my head :-/
It's good the colonoscopy was clear I would suggest you get a Stool test to cheak for blood and other nasty's even if you have already had one ,The HIDA scan is your last bet really, It would most likely find problems like cholecystitis or cystic duct obstruction Although these conditions often cause yellow or very pale stools not black ,It is certainly not in your head ..you could have IBS (irritable bowel syndrome) which is very common and is only diagnosed when all over tests are Normal. What about an MRI or CT scan have you had any of thoughts ?