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.
Extreme flatulence can even interfere with a person's ability to work and socialize comfortably with other people. Most cases of flatulence are related to factors that can be controlled. This is because intestinal gas usually comes from two sources â swallowed air or the work of intestinal bacteria on undigested food. Swallowing air is one cause of flatulence. Although much of this swallowed air is belched upward through the mouth, a small amount passes into the intestines and out through the rectum.