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.
Causes of Excessive Flatulence. Apart from the normal process of gas production explaineded above, there are other contributing factors to the gas in the gut that are not pathological (due to disease). Some of these may also result in excessive flatulence but in most cases, the gas is passed out in belching. This includes 1  : Air swallowing.