Usually dark red bloody stools are considered to be caused by diseases of the intestines. Common diseases such as malignant tumors of the colon or rectum, ulcerative colitis, and some infectious bowel diseases such as bacillary dysentery and amoebic enteropathy can present this symptom. In addition, bleeding in the lower gastrointestinal tract can appear as dark red bloody stools. If the bleeding in the upper gastrointestinal tract is particularly heavy in a short period of time, dark red bloody stools can also appear. Then there are systemic diseases, such as blood diseases, acute infectious diseases, toxic diseases, etc., which can also present dark red blood stools. It’s hard to say which one is the cause, but you have to look at it in conjunction with other symptoms. There is absolutely nothing wrong with blood in the stool, so we recommend that you go to the hospital quickly for a specific examination.