The whitening inside the stomach is usually described under gastroscopy, and it is mostly considered as white spots of mucosa, which may be caused by gastritis, gastric ulcer, gastric cancer and other reasons. 1. Gastritis: various types of gastritis may cause inflammatory reaction of gastric mucosa, intestinal epithelial hyperplasia and whitening of mucosa, resulting in whitening in the stomach. 2. Gastric ulcer: it is a common type of peptic ulcer, and the ulcer surface may cause localized erosion, with pseudomembrane covering it, resulting in whitening in the stomach. 3. Gastric cancer: it is a malignant tumor of the digestive system, which may also cause whitening in the stomach. There may be other reasons for the whitening inside the stomach, so it is necessary to go to the hospital in time for further examination to clarify the cause of the disease and follow the doctor’s instruction. In addition, you should live a regular life, have small and frequent meals, and avoid overeating.