In most cases, bitter taste in the mouth cause of gastrointestinal pathology. Because disorders of the liver, esophagus, pancreas, colon and stomach this symptom is typical for older age groups, because usually the older the man is always present in chronic disease of the gastrointestinal tract.
Other nonspecific reasons for the appearance of the mouth bitterness include: gingivitis and stomatitis, periodontitis, and poor-quality dentures, pathology of the thyroid gland and the intoxication with heavy metals, the use of certain drugs, and high nervous tension.
If bitterness arose in my mouth one time and is not accompanied by aggravating symptoms of pathological processes, it is not necessary to panic. The frequent appearance of this symptom requires a mandatory medical examination.