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.
When youâre up against a lot of flatulence, look for other abnormal symptoms including: 1  weakness or fatigue. 2  skin rashes, acne or hives. 3  signs of allergies, like watery eyes, itchy throat.  constipation or 1  diarrhea. blood in your urine or stool.  pain around your lymph nodes, including in your groin, throat or armpits.