Call a doctor! If it's REALLY black it can mean internal bleeding! Just tell a doctor!
NO!!!! this may indicate internal bleeding in the gut, digested blood looks like coffee ground in the stool. go see a doctor immidietly! this may be nothing but do you really want to take that...
Patients should be aware that Bismuth will turn bowel movements black.
yes it can i found this and other links in my search. http://ibdcrohns.about.com/cs/otherdiseases/a/blackstool.htm
The discharge of waste matter from the large intestine.