If there's no obvious reason for a black stool (such as food, a supplement, or a medication like Pepto-bismol), it could be time to look for blood in the stool. 1  A variety of medical reasons can cause black stools that are also tarry with a foul smell.
1 Lungs, kidneys or liver. Inflammation may cause pneumonia, bronchitis or other problems in your lungs; may lead to problems with kidney function; and may cause hepatitis or cirrhosis in your liver.  Lymph nodes. A small percentage of people with Sjogren's syndrome develop cancer of the lymph nodes (lymphoma).
Since being diagnosed with Sjogren's syndrome last year, I've had three urinary tract infections. No, but Sjogren's syndrome can cause symptoms that you might mistake for a urinary tract infection (UTI). Sjogren's syndrome is an autoimmune disorder in which the moisture-secreting glands of the eyes and mouth became inflamed, producing fewer tears and less saliva.