Why is the excrement black?

Excrement is a substance normally produced by organisms. It is the food residue remaining after digestion and ingestion in the body. This residue has no nutritional value and needs to be excreted from the body in time to ensure the health of the body and maintain the normal operation of metabolism. However, by observing excrement, we can discover many disease factors. For example, why is the excrement black?

Healthy stools are brown-yellow in color because normal people's stools contain bilirubin. Bright red is common in lower gastrointestinal bleeding. If the outer layer is sticky with blood in a small amount and is accompanied by severe pain, which disappears after defecation, it is anal fissure. If the blood is bright red, in varying amounts or in the form of blood clots, attached to the outer layer of the stool and not mixed with the stool, and the blood or blood clots can be washed away with water, there may be internal hemorrhoid bleeding. Another characteristic of hemorrhoidal bleeding is that a small amount of blood often drips or spurts out after defecation and stops on its own after a while. If the blood is bright red and mixed with the stool, it may be caused by intestinal polyps or rectal cancer or colon cancer. The bloody stool of rectal cancer is often mixed with erosive tissue. The bloody stools of colon cancer are characterized by fresh blood in small amounts accompanied by large amounts of mucus or pus.

Dark red is also called jam color because the feces are evenly mixed with blood. Common in amoebic dysentery, colon polyps and colon tumors. In addition, certain special diseases, such as thrombocytopenic purpura, aplastic anemia, leukemia, hemorrhagic fever, etc., can also cause blood in the stool due to coagulation disorder. This blood in the stool is generally dark red, sometimes bright red, and is often accompanied by bleeding in the skin or other organs. Another situation is that normal people who consume excessive amounts of coffee, chocolate, cocoa, cherries, mulberries, etc. may also have dark red stools.

Black stool is also called tarry stool because it is as black as the asphalt on the road. It is a common type of stool indicating gastrointestinal bleeding. It includes duodenal ulcer, gastric ulcer, antral gastritis, gastric mucosal prolapse, esophageal varicose vein rupture and bleeding in liver cirrhosis, etc. However, eating too much meat, animal blood, liver, spinach, oral iron and bismuth agents. Activated carbon, etc., feces can also be black and should be distinguished.

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