Whether a transverse colon polyp 0.4cm is serious or not is related to the nature of the intestinal polyp; if it is malignant, it is serious and needs to be removed immediately; benign polyps are usually not serious, but their removal is also recommended. Pathologic examination is required when polyps of the transverse colon are present. If the pathology result of transverse colon polyp indicates that it is malignant it is serious, which means that it has developed into intestinal cancer and must be removed immediately and combined with radiotherapy, etc. Benign transverse colon polyps are relatively less serious, but early removal is also recommended to prevent malignant changes. Benign polyps can be surgically resected without radiotherapy, and regular review is recommended. Patients should pay attention to eat more fresh vegetables, eat fruits in moderation, avoid eating greasy, cold, stimulating food, insist on exercise, enhance physical fitness, and maintain a calm mood.