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.
Normally we do have air in our bodies but a major cause of indigestion and flatulence is intestinal bacteria. This is the bacteria, which causes gas upon intake of foods. Majorly sugars and starches are the culprits here. This happens because this bacterium does not allow the food to be digested well into the intestinal passage. Bloating, burping and flatulence, all three are natural mechanisms to get rid of excessive gas in the body. Though these are natural procedures of the body expelling gas, repeated burps or urges to pass gas may interfere in your daily activities causing you discomfort and pain at times as well.