Proctitis does not usually cause wasting, but can cause wasting if accompanied by small bowel absorption dysfunction or prolonged inflammation and wasting. Proctitis is an acute and chronic inflammation that occurs in the rectal area, which is mainly manifested by pain on the left side of the abdomen, anal drop feeling, diarrhea and other symptoms. Proctitis is only mucosal inflammation in mild cases, and in severe cases, the inflammation can involve the submucosa, muscle layer and even perirectal tissues. Generally, it does not cause wasting, but if the disease spreads and causes absorption disorder in the small intestine or long-term inflammation stimulates consumption, it will affect the function of the digestive system and lead to indigestion, which is easy to malnutrition and lead to wasting. In addition, proctitis is also often seen in the low resistance of the population, combined with rectal tumors, injuries, anal fistula, and even seen in the combination of respiratory tract infections and other diseases, in which case the patient’s own disease consumes a lot of, may be manifested as proctitis accompanied by wasting. Daily attention should be paid to the monitoring of the condition, regular colonoscopy screening, dietary attention, avoid spicy and stimulating food, develop good living habits, strengthen physical exercise, enhance physical fitness.