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.
Alterations in bowel habit is a symptom that may occur in various diseases. 1  It may be accompanied by other symptoms include: 2  Bloating â a sensation of fullness in the abdomen. 3  Abdominal distension â swelling of the abdomen. 4  Excessive gas â either belching or flatulence. 5  Nausea and vomiting. 6  Abdominal pains and cramps.