Hi, Black coloured stools with bloating sensation in the stomach can be due to various reasons. We need to have a detailed history of associated symptoms. Most common cause of dark coloured stool is type of food we eat. Sometimes food like blueberries, beetroot they can cause dark coloured stools. Even intake of some medicines like iron supplements can also cause dark coloured stools. Besides this there are other medical reasons like liver disease, peptic ulcer (ulcer in stomach), esophagitis or gastritis (inflammation in esophagus or stomach). Hence, first of all, focus on your diet. Take bland food. Avoid taking too much of tea, coffee, oily and spicy food. Avoid smoking and alcohol intake. If still the symptoms persist then go for some investigations like complete blood count, stool test - routine and occult blood, liver function test, helicobacter pylori, ultrasound abdomen and upper GI endoscopy. Then we find the exact diagnosis. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Milinda Gupta, Internal Medicine Specialist