Blood discharged from anus, bloody stool, or bloody stool is bright red, dark red or tar-like, all of which are called bloody stool. The most common causes of hematochezia are as follows:

1. Hemorrhoids or anal fissure and anal fistula

The color of blood is generally bright red, and it is not mixed with feces and contains no mucus. It is characterized by bleeding after defecation, especially when the stool is hard.

2. Bacillary dysentery

The stool is often purulent and bloody, with a small amount each time, often accompanied by a sense of urgency and heaviness; The chronic phase is intermittent mucus and purulent bloody stool.

3. Amoebic dysentery

Most stools are jam-like, or dark red, with a large amount, often accompanied by purulent mucus. Most patients have fever, abdominal distension, abdominal pain and acute diarrhea.

4. Gastric and duodenal ulcers and bleeding

Most feces are tar or black.

5. Ulcerative colitis

Abdominal pain, diarrhea, often accompanied by acute diarrhea. Generally, stool is mucus, pus and bloody stool, and in severe cases, it can be bloody stool.

6. Rectal cancer

Suffering from chronic diarrhea or recurrent mucus purulent stool, accompanied by acute diarrhea and severe diarrhea, the possibility of rectal cancer should be considered when general anti-inflammatory treatment fails.

7. Colon cancer

The possibility of colon cancer should be suspected when the stool becomes thin and accompanied by mucus purulent blood. A few patients may only show fixed abdominal pain.

8. Rectal and colon polyps

Polyps of rectum, sigmoid colon or descending colon are characterized by fresh blood attached to stool, and blood does not mix with stool.

If you want to find out the specific cause of hematochezia, it is recommended to go to the gastroenterology department or anorectal department of the hospital, and it is best to have a colonoscopy.