Have Medical Questions? Ask a Doctor Online!
Hello, this is Dr. David. I am reviewing your question now and will be with you momentarily.
dark green stools are 100% normal
tar black stools can be a sign of bleeding from your stomach or esophagus, possibly from a stomach ulcer or esophageal bleeding.
do you have any reasons to have stomach or esophagus bleeding
you can see your doctor to get stool occult blood tests to check your stools for blood.