 [ Symptoms ] i just had a jet black poop could this be from drinking a lot of beer i feel fine right now  as i mentioned above i do have gerd lately though i have had good brown poops this is the first time i have had one this dark i generally know when my gerd is bad because i will deal with a burning stomach heartburn and bad acid reflux this is the main reason why i think it was caused by the beer i did drink a lot since it was my twenty first birthday mainly budweiser [ Disease ] or something very serious is happening when you have a bleeding area in the stomach the hydrochloric acid will turn it jet black and this will cause tarry stools i have no idea if this is the underlying reason but it would be in your best interest to see a medical provider right away to determine if this black stool is blood or not another possibility would be pepto bismol if you were taking it