The color of blood and stool can be bright red, dark red or tarry (black stool).
1. Bright red: mostly seen in the lower gastrointestinal tract bleeding, the color is more bright red, the closer to the anal part of the bleeding color is more bright red, especially the bleeding of colon and rectal lesions, such as colorectal tumors, inflammation, hemorrhoids, anal fissure and so on.
2. Dark red: it can be seen in upper gastrointestinal bleeding, which is called blood in stool, usually in dark red color, and the blood is mixed with feces, which mostly occurs in gastric ulcer, ruptured varicose vein of the fundus, gastric tumors and so on.
3. Asphalt-like (black stool): accompanied by bleeding from the skin, mucous membranes or other organs, it is usually asphalt-like (black stool), which is mostly seen in hematologic and other systemic diseases, such as leukemia, disseminated intravascular coagulation, etc. The causes of blood in stool are complicated.
The causes of blood in stools are complicated, and patients are advised to go to the hospital in time to find out the cause of the disease and take active treatment.