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.
Some carbohydrates in food can't be digested and absorbed by the intestines. These pass down into your colon to be broken down by bacteria, producing gas, which is released as flatulence. Foods containing a lot of unrefined cereal fibre, such as bran, can also sometimes cause problems with wind and bloating. Other foods and drinks that contain a sweetener called sorbitol (such as sugar-free gum or slimming products) or a type of sugar called fructose (such as fruit juice) can also cause flatulence. This means chewing sugar-free gum can cause flatulence from both the sweetener and swallowing air. Certain foods, such as cabbage or onions, can lead to the production of gases containing sulphur, which can result in foul-smelling wind.