There are many causes of bitter mouth, including poor habits, oral diseases, gastrointestinal diseases, liver diseases, endocrine diseases, etc.

1. Poor lifestyle habits: Long-term smoking, alcoholism, excessive consumption of spicy, greasy, irritating food, drinking too little water, staying up late for a long time, lack of sleep and other bad habits may lead to dry mouth and bitter mouth. Smoking can irritate the oral mucosa and affect saliva production; Alcoholism can damage the liver and affect the normal secretion and excretion of bile; A spicy and greasy diet can increase the burden on the stomach and intestines, causing indigestion, resulting in symptoms of dry mouth and bitter mouth.

2. Oral diseases: Such as dental caries, gingivitis, periodontitis, mouth ulcers, etc. Tooth decay can lead to tooth decay, and food debris is easy to become embedded in the cavities, breeding bacteria and producing odors. Gingivitis and periodontitis can cause the gums to become red, swollen and bleed, and bacteria in the mouth can multiply, decompose food debris and produce a bitter feeling in the mouth; Canker sores can cause pain and interfere with normal oral function, leading to decreased saliva production and dry mouth.

3. Gastrointestinal disorders: Common gastritis, gastric ulcer, duodenal ulcer, dyspepsia, gastroesophageal reflux disease, etc. Gastritis and gastric ulcer can lead to damage to the gastric mucosa, excessive gastric acid secretion, causing symptoms such as heartburn and acid reflux, and may be accompanied by dry mouth and bitter mouth; Patients with duodenal ulcer have increased gastric acid secretion when fasting, which stimulates the ulcer surface, and will also have bitter mouth; Indigestion will make food stay in the gastrointestinal tract for too long, and fermentation produces gas, resulting in bad breath, dry mouth and bitter mouth; GERD causes stomach acid to reflux into the esophagus and even to the mouth, causing bitter mouth.

4. 肝膽疾病: For example, cholecystitis, gallstones, hepatitis, cirrhosis, etc. Cholecystitis and gallstones can affect the excretion of bile, bile reflux into the stomach and esophagus, and even the mouth, resulting in bitter mouth; Hepatitis and cirrhosis can impairing liver function, abnormal bile metabolism, and symptoms of dry mouth and bitter mouth may also occur.

5. Endocrine diseasesFor example, in diabetes, the patient's blood sugar rises, which can cause osmotic diuresis, resulting in a large loss of water in the body and symptoms of dry mouth. At the same time, diabetic patients have weakened immunity and are prone to oral infection, which further aggravates dry mouth and bitter mouth.

Dry mouth and bitter mouth can be caused by a variety of reasons, involving lifestyle habits, oral cavity, gastrointestinal, hepatobiliary and endocrine and other aspects. When symptoms of dry mouth and bitter mouth appear, you should adjust your lifestyle habits in time to keep your mouth clean. If the symptoms persist or are accompanied by other discomforts, you should go to a regular hospital in time for relevant examinations to determine the cause and carry out targeted treatment under the guidance of a doctor.

This article is only for health science popularization and does not constitute medication or medical guidelines, it is recommended to seek medical attention in time if you have health problems.