let's discuss this together with our expert fedor aleksandrovich chernousov, doctor of gastroenterologyiences, professor, leading researcher of the department of false taracabryonic surgery or ambulance named good morning. hello well, in principle, this is probably the first. here's what we've shown so far stomach problem. yes, you are absolutely right, sour breath can indicate stomach problems. it could be gastritis. it could be erosive gastritis. it could be a stomach ulcer, and it could also be, uh, incomplete closure of the valve between the stomachs by the esophagus, when the contents of the stomach are thrown into the esophagus, belching can occur and what a person has in the stomach. these gases, they come out, just outside, there can be a very strong and unpleasant smell, which can be, well, up to a meter even from a person, that is it is difficult to communicate with him, but this is in advanced cases. well, this is probably the most obvious reason, but there are others. yes, we smell like rotten fish. this does not mean that a person has eaten rotten fish. they really like rot