What causes anal bleeding

If you want to effectively solve the problem of anal bleeding, you should first pay attention to understand the causes. The most common causes are hemorrhoids, colorectal cancer, or ulcerative colitis. When we understand these causes, we will know how to effectively prevent and treat them in life.

1. Hemorrhoids: If you have external hemorrhoids, you can feel a soft nodule at the anus, but you cannot feel internal hemorrhoids. The amount of bleeding is heavy and not mixed with the stool. Sometimes there is only blood stain on the toilet paper. The bleeding is often related to dry stool or excessive force during defecation.

2. Rectal and colon cancer: These diseases have increased significantly in recent years, and the incidence rate has increased by 2-3 times. At the beginning of the disease, a small amount of blood can be seen covering the surface of the stool. As the disease progresses, the amount of blood in the stool gradually increases, the stool may become thinner, and even intestinal obstruction may occur (no bowel movement, no flatulence, vomiting, abdominal masses, abdominal pain). The stool may have a special odor produced by pus, mucus and cancerous tissue. When systemic symptoms appear, such as decreased appetite, weight loss, edema, anemia, etc., the disease is already in the late stage.

3. Ulcerative colitis: The blood may be bright or dark in color, and almost every stool is mixed with blood and pus. There are often abdominal pain and diarrhea, which may recur or persist for a long time.

4. Colorectal polyps: Some are benign, while others are prone to malignant transformation (such as adenomatous polyps and villous adenomas). The incidence rate increases with age and may occur singly or multiple times. Blood in the stool is often intermittent and bright red in color. Generally, the amount of blood is not large and the blood is not mixed with the stool. There are no special changes in the stool itself.

5. Colonic vascular dysplasia: It is more common in middle-aged and elderly people. Bleeding is mostly fresh blood, the amount of bleeding is large, and there is no change in the stool itself.