Vinegar can be harmful to stomach acid. There is a large amount of gastric acid component in the stomach, and gastric acid is the most direct factor that leads directly to gastric erosion, gastric congestion, and even gastric ulcer. Although there is a gastric mucosal barrier in the stomach, the main component is carbonic acid, but if a large amount of gastric acid can easily lead to damage of gastric mucosa. The main component of vinegar is worse for gastric acid, but it also has a certain acidity, and this acidity can also play a certain role in damaging the gastric mucosa, so vinegar and gastric acid are both direct attack factors that cause damage to the gastric mucosa. Appropriate use of drugs to protect the gastric mucosa or pay more attention to the diet is beneficial to improve the gastric mucosa, promote mucosal repair and prevent the occurrence of gastric ulcers. If you have stomach diseases, you need to improve gastroscopy to further clarify the diagnosis.