White moss on the bottom of gastric ulcer mainly refers to the exudation of inflammatory cells on the ulcer surface resulting in purulent secretion, so it looks like white moss. If the moss is dirty or yellowish in color, it is necessary to consider whether there is a possibility of cancer. It is normal for patients with gastric ulcer to have white moss on the bottom, so patients with gastric ulcer should pay attention to avoid overeating and eating spicy, stimulating, cold and rough food, which are not conducive to the healing of gastric ulcer. Also try to reduce the food or drugs that can easily stimulate the gastric ulcer, in order to promote the healing of gastric ulcer as soon as possible.