Bleeding from anus

Bleeding from the anus is a very painful symptom. When this symptom occurs, it is necessary to first find out the cause and then carry out appropriate treatment to achieve the effect of curing the symptoms and the root cause. Generally speaking, fresh blood from the anus is caused by diseases such as hemorrhoids, rectal cancer, colon cancer, ulcerative colitis, colorectal polyps, and colon vascular dysplasia. Here are some possible causes of anal bleeding.

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

In recent years, the incidence of these diseases has increased significantly, 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. Colon 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 can be single or multiple. 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. The bleeding is mostly fresh blood, the amount of bleeding is large, and there is no change in the stool itself.

1. Hemorrhoidal blood in the stool: It is usually bright red, not mixed with stool but attached to the surface of stool; it may also appear as dripping blood before or after defecation, and in severe cases it may be jet-like, which often occurs when the stool is constipated.

2. Blood in the stool due to anal fissure: The amount of blood in the stool is small, and most of the time it is found on toilet paper; defecation may be accompanied by severe anal pain, so that the patient dare not defecate.

3. Blood in stool caused by polyps: There is no discomfort during defecation, the stool is normal, and blood is often attached to the surface of the stool.

4. Blood in the stool due to colorectal cancer: It manifests as persistent, chronic bloody stools with mucus mixed with feces, frequent urge to defecate, and sometimes only some blood or mucus without feces. The farther the cancer is from the anus, the lower the incidence of bloody stools. About 80% of colorectal cancer patients have blood in their stools.