Bad oral hygiene can lead to sour taste. Excess use of tea, caffeine, cocaine and tobacco can cause sour mouth. Injuries to nerves or brain can lead to sour taste. If you are suffering with depression, stress disorders or anxiety, it may also be a cause of sour taste in the mouth.
Health conditions. Certain health conditions can cause symptoms of flatulence, including: 1  indigestion. 2  constipation. 3  irritable bowel syndrome (IBS) â a common digestive condition, which can cause stomach cramps, bloating, diarrhoea and constipation. 4  coeliac disease â an intolerance to a protein called gluten, found in wheat, rye and barley.
Flatulence: Gas buildup in the colon. Intestinal gas is typically caused by the fermentation of undigested food, such as plant fiber, in the colon. Gas can also form when your digestive system doesn't completely break down certain components in foods, such as gluten or the sugar in dairy products and fruit. Other sources of intestinal gas may include: