Hello,
Stool that is black and sticky (sometimes described as “tarry”) is concerning for something called melena, which is from blood in your GI tract that has been digested and turns a black color. In order for the blood to be digested like this, it has to be farther up in your gastrointestinal tract, usually in the stomach. so I would be concerned about a possible
stomach ulcer that is bleeding and causing these changes in your stool. This would not be related to your
anal fissure and hemorrhoids, so I would suspect that is unrelated.
I would recommend getting your blood checked to see if there is any evidence of blood loss, as well as getting a hemoccult tested on your stool to see if there is any blood in it. If those tests show any evidence of a GI bleed, or if you have any symptoms such as
abdominal pain, an EGD would likely need to be done to determine whether you have a bleeding ulcer or other cause of bleeding or not.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Aaron Branch, General & Family Physician