I. Definition Hemorrhoids: Hemorrhoids are soft venous masses formed by enlarged varicose veins under the mucous membrane at the end of the anus and the subcutaneous plexus of the anal canal or by subcutaneous thrombosis or hyperplasia of connective tissue at the lower end of the anal canal. Rectal cancer: a malignant tumor formed by malignant cell proliferation in human and animal bodies due to certain factors. The growth of malignant tumor cells is in a state of uncontrolled, can invade normal tissues, and often metastasize to grow far from their origins. The nature of hemorrhoids: benign, mildly affects the quality of life, and seriously endangers health. Rectal cancer: malignant, can be fatal. Clinical manifestations Hemorrhoids: (1) Painless blood in the stool, bright red in color. (2) Anal swelling prolapse. Rectal cancer: (1) mainly painless, dark red blood stool, or mucus stool, pus and blood stool, with a special fishy odor. (2) Change of bowel habit. (3) Thinner stool. (4) Abdominal mass. (5) Systemic symptoms: anemia, wasting, fever (hypothermia), and weakness. (6) Symptoms arising from local invasion or metastasis, such as metastasis to the lung or liver and symptoms of the relevant parts. Hemorrhoids: (1) Internal hemorrhoids (2) External hemorrhoids (3) Mixed hemorrhoids Rectal cancer: (1) Adenocarcinoma (2) Mucinous adenocarcinoma (3) Indolent cell carcinoma (4) Undifferentiated carcinoma The above can be used as a simple comparison, but it is still strongly recommended to go to a regular hospital outpatient anorectal clinic to consult a doctor, do not avoid the disease, after all, it is difficult for non-professionals to make an accurate judgment. In conclusion, once blood in stool occurs, there is no need to panic, but it should not be taken lightly and should be treated as early as possible.