Drinking vinegar is harmful to the stomach, vinegar is an acidic chemical that can lower the PH value in the stomach, vinegar can stimulate the gastric mucous membrane when drunk into the stomach, which can cause damage to the gastric mucous membrane in serious cases, forming erosive gastritis and even gastric ulcer, thus causing a series of gastrointestinal symptoms, such as stomach pain, gastric distension, indigestion, etc. In serious cases, blood in the stool can occur, so normal people should drink vinegar as little as possible. In addition, patients with gastric diseases, such as erosive gastritis, gastric ulcer, duodenal ulcer, should not drink vinegar, because vinegar can accelerate the destruction of the gastric mucosa, leading to the aggravation of various symptoms, causing the aggravation of the primary disease, so try to drink less vinegar.