What causes blood in a man's stool?

Blood in a man's stool may be caused by improper diet, hemorrhoids, anal fissures, ulcerative colitis, intestinal polyps, or other factors. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under the guidance of a qualified physician. Specific analysis is as follows:

1. Improper Diet

Consuming excessive spicy, greasy, or irritating foods—such as hot pot or spicy hot pot dishes—may irritate the intestinal mucosa, leading to blood in the stool. It is advisable to adjust the diet by increasing intake of fiber-rich foods such as vegetables and fruits (e.g., cucumber, grapefruit, kiwi), which can help alleviate symptoms.

2. Hemorrhoids

Hemorrhoids may be associated with poor bowel habits or prolonged sitting. When hemorrhoids develop, they are easily irritated or injured during defecation, causing bleeding. This typically presents as fresh blood on the stool or dripping blood after bowel movements. Men are advised to use medications such as Ma Ying Long Musk Hemorrhoid Ointment, Huaijiao Pills, or Huazhi Tablets as directed by a physician.

3. Anal Fissure

When stools are overly dry, they may exert pressure on the anus during defecation, potentially causing partial or complete tearing of the anal skin, resulting in bleeding and possibly accompanied by anal pain. Men should follow medical advice to use medications such as Xiongdan Hemorrhoid Ointment, Longzhu Ointment, or glyceryl trinitrate ointment for treatment.

4. Ulcerative Colitis

This condition may be related to factors such as sudden smoking cessation in long-term smokers or prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs). During flare-ups, damage to the intestinal mucosa may lead to bloody stools, often accompanied by abdominal pain and diarrhea. Men should take medications such as methylprednisolone tablets, mesalazine enteric-coated tablets, or balsalazide sodium granules under a doctor’s supervision to manage symptoms.

5. Intestinal Polyps

Intestinal polyps are usually caused by genetic factors or chronic inflammation. Polyps may bleed when irritated, manifesting as blood in the stool and possibly accompanied by anal discomfort. Men should seek timely medical care and may require minimally invasive surgery via endoscopy through the anus for treatment.

In daily life, men are advised to avoid prolonged sitting, drink plenty of warm water, and engage in moderate physical exercise such as running or walking, which can help relieve discomfort.