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 Gas: Food. Have you ever eaten a meal or a particular food that bothers your digestive system and afterward experienced painful gas and bloating for hours? Foods are a major cause of excessive gas. Beans are a well-known culprit, but there are many others. Each food affects everyone differently, but here are some that commonly cause flatulence and burping. You may need to avoid them to manage your excessive gas: Milk and dairy products. Apricots, raw apples, and bananas. Prunes and prune juice. Beans. Onions.