what causes a sour taste in your mouth
Post Nasal Drip. Another cause of sour taste in the mouth is post nasal drip. The mucus in the nose is rich in protein and provides a good breeding ground for bacteria. As a result, the bacteria multiply on a large scale and get accumulated at the back of the tongue.
Sour taste could be due to lack of saliva in the mouth or dry mouth, vitamin deficiencies, chronic and periodontal diseases, certain drug intake or even neurological disorder. If this problem is persistent, you should first try concluding your own cause and then treat it accordingly.
Sometimes the bad taste in your mouth can be a side effect of some medications. Also, smoking interferes with your taste buds and can leave you with a constant unpleasant taste in your mouth. Many women who are pregnant experience a sour taste in their mouth due to hormonal changes in their bodies.