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Bright Red Blood in Stool

Updated on June 2, 2017

A bloody stool scares most people

Bright red blood in stool is alarming because it points to bleeding in the gut. However, not all red stools are caused by bleeding. The color can also come from food.

Foods Associated with Red Stool

In the quest to reduce cost and increase profit, synthetic food colorants have become much more popular than natural colorants. Unfortunately, our digestive enzymes can't completely break down some of these artificial dyes. After consumption, a large portion of a red dye could be excreted intact, retaining its red color—staining your stool blood red.

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Eating lots of beets can stain your stool blood red.The red pigment in ripe tomatoes could give your stool a red tint.Candies such as red licorice can lead to a red stool.Flavored liquid containing artificial coloring (frozen around a stick) can color your stool.If you eat too much red jelly, there is a good chance it will show up in your stool.Too much red drinks and Soda could stain your stool.Little pieces of red pepper can show up in your stool.Eating lots of red Velvet cakes can color your stool.Do not mistake cranberry or cranberry juice for bright red blood in your stool.
Eating lots of beets can stain your stool blood red.
Eating lots of beets can stain your stool blood red. | Source
The red pigment in ripe tomatoes could give your stool a red tint.
The red pigment in ripe tomatoes could give your stool a red tint. | Source
Candies such as red licorice can lead to a red stool.
Candies such as red licorice can lead to a red stool. | Source
Flavored liquid containing artificial coloring (frozen around a stick) can color your stool.
Flavored liquid containing artificial coloring (frozen around a stick) can color your stool. | Source
If you eat too much red jelly, there is a good chance it will show up in your stool.
If you eat too much red jelly, there is a good chance it will show up in your stool. | Source
Too much red drinks and Soda could stain your stool.
Too much red drinks and Soda could stain your stool. | Source
Little pieces of red pepper can show up in your stool.
Little pieces of red pepper can show up in your stool. | Source
Eating lots of red Velvet cakes can color your stool.
Eating lots of red Velvet cakes can color your stool. | Source
Do not mistake cranberry or cranberry juice for bright red blood in your stool.
Do not mistake cranberry or cranberry juice for bright red blood in your stool. | Source

Medical Conditions Associated with Bright Red Blood in Stool

Hematochezia is the medical term for bright red blood in stool. Rectorrhagia is when only blood is present without any bowel movement. Bleeding can occur anywhere in the gastrointestinal (GI) tract, this includes the mouth, esophagus, stomach, small and large bowel.

Blood travelling through the gut turns black as it gets broken down by digestive juices. The farther away the bleeding is from the anus, the more likely blood from it will be broken down before excretion. A dark or black stool suggests bleeding high up the GI tract.

On the other hand, bright red blood in stool suggests bleeding in the lower part of the GI tract. The bleed in this case is closer to the anus. This does not leave sufficient time for blood to be broken down by digestive juices. Hence, the red maroon color of blood can be seen in pieces of stool in the toilet bowl or on the toilet paper. There are various conditions associated with GI bleeding, some of the common ones are mentioned below.

  • Anal fissures are tears in the lining of the anal canal. People with anal fissures are typically presented with sharp tearing pain and bleeding, often during defecation. The pain may last minutes to hours after defecation and can progress to burning and itching. Anal fissures commonly occur when a dry constipated stool scratches the wall of the anal canal. They sometimes heal on their own without any real medication.
  • Diverticulosis is a condition associated with the formation of small pouches in the lining of the colon. Doctors believe that blood vessels in these pouches may weaken and rupture causing bloody stools. Even though not proven, doctors say that people on low fibre diets are more prone to develop diverticulosis. Some symptoms of diverticulosis are linked to significant loss of blood. These include fatigue, shortness of breath and light-headedness.
  • Ulcerative colitis is a disease that causes severe inflammation of the mucosa of the colon. According to researchers, some individuals are genetically predisposed to developing ulcerative colitis. Factors that can trigger the disease include microbes, autoimmune reactions and food allergies. The inflammatory process begins primarily in the rectum and can spread to other parts of the colon as the disease progresses. It can cause significant bleeding when it erodes down to blood vessels. Other symptoms are fever, diarrhea, fatigue and abdominal pain.
  • Arterio-venous malformation (AVM) is an abnormal collection of blood vessels that can bleed intermittently. The bleeding is mainly because AVM-arteries connect directly to AVM-veins without passing through capillaries. The small size of capillaries reduces pressure as blood moves through to veins. Veins have thin walls and are generally not meant to withstand high pressures. AVM-veins can easily rupture causing bleeding.
  • Hemorrhoids or Piles are swollen, inflamed veins inside or around the anus. They mainly result from the exertion of too much pressure on the anal region. This is common during pregnancy, constipation, prolonged sitting, heavy weightlifting or obesity. Rectal bleeding occurs when the delicate surface of the hemorrhoid is damaged—mainly from strain or irritation. Additional symptoms are rectorrhagia, redness, itching, rectal pain and discomfort.
  • Colon cancer is cancer that starts in the colon. It is often discussed together with rectal cancer hence also referred to as colorectal cancer. Regular screening is recommended for high risk individuals in order to catch the cancer before it develops. It is highly curable when diagnosed at an early stage. Key symptoms that suggest colon cancer include fatigue, anemia, weight loss, diarrhea, constipation, bloating and other changes in bowel habits. However, doctors have reported cases of colon cancer with no symptoms.

Bleeding from the Upper GI tract

Hemoglobin is the part of a red blood cell that contains iron. Unlike bleeding in the lower GI tract, blood from upper GI bleeding has enough time to interact with digestive juices. Iron in hemoglobin is oxidized as it passes through the gut. This results to a black, tarry stool known as melena.

Melena is worrisome because it indicates active bleeding from the upper gut. The color of blood in stool is a good indicator of the source of the bleeding. Medical causes of melena include:

  • Peptic ulcer: sore in the upper part of the small intestine.
  • Esophagitis: inflammation of the esophagus.
  • Gastritis: inflammation of the stomach lining.
  • Esophageal varices: abnormal enlarged veins in the esophagus.
  • Gastric varices: abnormal enlarged veins in the stomach.
  • Mallory-weiss syndrome: tear in the mucus membrane at the stomach and the esophagus.

Situations that can Lead to False Melena

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Foods that can give false melena – Blueberries.Foods that can give false melena – Licorice (Black)Foods that can give false melena – Blood sausageBlood ingested from bleeding in the mouth or nose can lead to a black stool.Intake of iron supplement and medications containing Bismuth Subsalicylate have been reported to cause black or dark stool.
Foods that can give false melena – Blueberries.
Foods that can give false melena – Blueberries. | Source
Foods that can give false melena – Licorice (Black)
Foods that can give false melena – Licorice (Black) | Source
Foods that can give false melena – Blood sausage
Foods that can give false melena – Blood sausage | Source
Blood ingested from bleeding in the mouth or nose can lead to a black stool.
Blood ingested from bleeding in the mouth or nose can lead to a black stool. | Source
Intake of iron supplement and medications containing Bismuth Subsalicylate have been reported to cause black or dark stool.
Intake of iron supplement and medications containing Bismuth Subsalicylate have been reported to cause black or dark stool. | Source

Fecal Occult Blood Test (FOBT)

It takes a significant amount of blood to be able to visually detect bleeding in one’s stool. If a GI bleeding drops below a certain threshold, blood in stool may no longer be visible.

FOBT is a test performed to detect small amounts of blood in stool, quantities smaller than can be detected by the naked eye.

There are several different methods to do the FOBT test. One method involves the following steps:

  • A small amount of fresh fecal sample is collected and smeared onto a small test card.
  • The card is then sent to the lab.
  • A special solution is added to the smear.
  • The smear should turn blue in the presence of blood.

Final comments

There is a stigma surrounding bowel disorders. Sufferers of bowel disorder are often embarrassed to talk about their bowel habits. Bright red blood in stool is a red flag but does not always point to a disease. However, it may be caused by a simpler condition such as anal fissures or a potentially life-threatening condition such as colorectal cancer.

Generally, blood in your stool must prompt you to take a trip to your doctor to make sure it is not associated to a serious condition. A large amount of bleeding (including melena) can be life-threatening. In this case, you should seek urgent medical attention.

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      Jegrossart 7 months ago

      beware of Nestle, Nesquik Strawberry Syrup. I was ready to take my son to the emergency room last night. I even called the Kaiser nurse and after my explanation she said "yes, please take him to be seen as soon as possible" As we were leaving I asked again to tell me all hed eaten. He said he felt fine. Finally he remembers putting Nesquik Strawberry Syrup on a slice of pumpkin pie. I squirted a few Tablespoons into the toilet and the color matched the picture i had taken to share with the doctor. Scared the heck out of me thinking so much blood was in his stool. Thankly just syrup passing through him. I am tossing the rest. Creepy stuff.

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