Bitter eructation is an involuntary throwing of air and liquid contents into the oral cavity due to contraction of the smooth muscles of the gastrointestinal tract, after which the patient feels the taste of bitterness in the mouth. Episodic erection may be associated with nutritional errors, but more often regurgitation is observed in diseases of the biliary system and duodenal-pancreatic zone. To determine the cause of the symptom, X-ray, endoscopic, ultrasound and laboratory studies are carried out. To stop belching, prokinetics, antispasmodics and choleretic agents are used.