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, also known as farting or passing wind, is the passing of gas from the digestive system out of the back passage. Flatus is the medical word for gas generated in the intestinal tract. Endogenous sources-it is produced within the gut. 2  Gas may be produced as a by-product of digestion of certain foods, or when foods are not digested completely. 3  Anything that causes food not to be digested completely by the stomach and/or small intestine can cause flatulence when it reaches the large intestine.