Rectal cancer is all malignant, that is, malignant tumor, there is no benign, if benign should refer to rectal polyps or rectal adenoma. There is not much difference between the two in terms of clinical manifestations, most patients show increased frequency of stools, thinning of stools, unformed stools, or even blood in stools. Therefore, if the above symptoms appear, you should go to the hospital for examination, including anorectal examination and colonoscopy. If the lesions inside the rectum can be found early and treated early, the surgical effect is very good. Because rectal cancer is a malignant tumor, metastasis may occur, including local lymph node metastasis and distant metastasis, such as liver metastasis, lung metastasis, and even bone metastasis. Benign rectal lesions will not metastasize, but only have local enlargement of the mass or bleeding on the surface of the mass, resulting in anal bleeding, etc.