6 causes of bloody stools – VnExpress

Blood in the stool is a warning sign of many diseases in the anal-rectal area such as hemorrhoids, polyps, ulcers.

Doctor, Dr. Vu Truong Khanh – Head of Gastroenterology – Hepatobiliary – Pancreatic Department, Tam Anh General Hospital in Hanoi, said that bright red blood or clotted blood in the stool is an abnormal phenomenon, warning of post-traumatic injury. rectal, rectal, or colonic for many reasons. Blood may or may not be mixed with stool. To form a blood clot, blood has to flow near the anal area before the patient wants to have a bowel movement.

“Based on the color of the blood, it is possible to find the location of the lesion. The darker the blood, the higher the source of bleeding in the digestive system. Bright red blood is often a sign of bleeding in the colon or rectum. and anus,” said Dr. Khanh.

This condition is mostly a manifestation of diseases of the rectum and anus, which can occur at any age. Below are the diseases that cause blood clots in the stool according to Dr. Khanh.


When you have hemorrhoids, the veins in the lower rectum area are dilated, swollen and larger than normal, forming hemorrhoids inside or outside the anus. These veins can rupture causing anal pain and bloody stools. People with hemorrhoids often defecate bright red blood in the form of drops or sprays when pushing or only a little stick on toilet paper.

If the hemorrhoid causes heavy bleeding back into the rectum, a blood clot can form. In some cases of thrombosed hemorrhoids, anal pain is caused by a blood clot that develops inside the hemorrhoid.

Anal fissure

Prolonged constipation causes anal fissures. In addition to itching, burning pain, swelling, when defecation, the veins in the anus are stretched too much, causing stools with fresh blood or blood clots. Anal fissures are susceptible to infection, increasing the risk of fistulas and anal ulcers.

Ulcerative colitis

Abdominal cramps, straining, blood clots, thirst… are manifestations of ulcerative colitis. The disease occurs when the lining or submucosa of the rectum becomes inflamed and bleeds. Many cases of ulcerative proctitis cause massive bleeding. The cause of the disease is usually bacillus dysentery, amoeba parasites…

Patients may experience discomfort due to blood clots. Image: Freepik

Colorectal polyps

Round or elliptical tumors (polyps) develop on the inner lining of the colon, the anus, and tear during defecation. Some large polyps can cause heavy bleeding, leading to blood clots in the stool. Polypectomy is the solution to this problem.

Diverticulitis of the colon

People over 40 years old, obese, smoker, sedentary, eat less fiber… are at risk of colonic diverticulitis. Usually, diverticula in the colon don’t cause any symptoms, and people don’t know they exist in the body, unless it’s inflamed or infected. When one or more of the small blood vessels in these sacs rupture, leading to diverticulitis, bright red blood or clots can be passed out.

Anal – rectal cancer

Small tumors or polyps in the lumen of the anus or rectum can develop into cancer. Patients with anorectal cancer often feel fatigue, weakness, anemia, unexplained weight loss, digestive disorders, especially bloody stools like meat wash.

Faeces with blood clots due to bleeding from the small intestine are present but are uncommon. These cases often lead to excessive bleeding leading to increased intestinal motility, creating blood clots in the colon that have not been digested. According to Dr. Khanh, blood clots in the stool are one of the warning signs of a damaged digestive system. It can be a simple and benign disease like hemorrhoids but it can also be malignant. Without timely and proper intervention, many complications will arise, making treatment difficult.

When the above signs are accompanied by abdominal pain, prolonged fatigue, rapid heart rate, dizziness, shortness of breath, etc., the patient should quickly go to the medical facility to receive a digestive endoscopy doctor. Early identification of the source and timely treatment reduce the burden of disease and increase quality of life.

Trinh Mai


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