Intestinal bleeding is bleeding from the lower gastrointestinal tract, and patients may present with dark red or bright red blood or even black stools. The color of the blood depends on the location of the bleeding intestine and the amount of bleeding, generally the closer to the mouth side the darker the color will be, and the closer to the anal side the brighter the color will be. Small intestine bleeding is dark red or black when the amount is small, and bright red when there is a lot of bleeding, which is usually seen in diseases such as small intestine tumors and vascular malformations. When the colon and rectum bleed, the blood is bright red because the blood stays in the intestine for a shorter period of time, which is mostly seen in diseases such as hemorrhoids, colorectal cancer, colorectal polyps, etc. It is recommended that when you have intestinal bleeding, you must go to the hospital for relevant examination and timely treatment.