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.
Even if you don't have any of these serious conditions, you still might experience gas. Other common causes of flatulence include: 1  Too much fiber too soon. 2  Lactose intolerance. 3  High legume diet-beans are legumes. 4  Fatty foods that you cannot digest. 5  Dairy products that you cannot digest or are allergic to. 6  Improper food combining.