I had an upper endoscopy last year, May of 2014, because I was having pain in my stomach. I was diagnosed with erosive gastritis and a fatty liver. My question is as follows, I have had very dark black stools the past week. This morning it was diarrhea, and extremely black. Then in the afternoon I had another bowel movement and it was hard, but again charcoal black. I m really concerned about this, because I have an uncle who died of stomach cancer and black stools were one of his symptoms. Should I see my gastroenterologist?