When defecate, hematochezia, anus also aches, what reason

Anal fissure: The anal canal skin is split vertically and forms an infectious ulcer, which is typically manifested as anal pain, hematochezia and constipation. 2. Hemorrhoids: Internal hemorrhoids or mixed hemorrhoids can cause bleeding and pain when developed to a certain extent. 3. Anal canal or rectal injury: Anal canal or rectum due to trauma or surgery caused by laceration, can cause anal pain and hematochezia. 4. Rectal, colon polyps: red blood, painless, blood and stool do not mix. 5. Ulcerative colitis: mucus purulent blood stool, accompanied by abdominal pain, fever, stool frequency. 6. Other: such as anal sinusitis, proctitis, rectal cancer, etc. can cause anal pain and hematochezia. It should be noted that there are many reasons for anal hematochezia accompanied by pain when defecating, and it may be a common manifestation of multiple diseases. If the symptoms persist or are accompanied by other discomfort, seek medical attention promptly, conduct detailed examination and diagnosis, and treat under the guidance of a doctor. In addition, for pregnant women, the elderly, long-term constipation or diarrhea, family history of anorectal diseases and other special groups, should pay more attention to anal health, maintain good living habits, such as moderate exercise, balanced diet, develop good defecation habits, etc., in order to prevent the occurrence of anorectal diseases. If anal hematochezia or other abnormal symptoms occur, seek medical attention promptly so that potential health problems can be identified and treated early.