Blood in the stool is defined as blood in the stool or full blood in the stool after bleeding from the digestive tract through the intestines, and can be bright red, dark red or tarry in color. The color of the bloody stool depends on the location of the bleeding, the amount of bleeding and how long the blood stays in the GI tract. If the bleeding is from the lower GI tract (small intestine, colon, rectum, anus), the stool is often bright red. If the bleeding is from the upper gastrointestinal tract (esophagus, stomach, duodenum), the stool is often dark red or tarry.
What diseases can cause blood in the stool?
1. Hemorrhoids. Hemorrhoids are a common anorectal surgery (colorectal surgery) disease. If the condition is serious or the stool is dry, it may cause the mucous membrane of the hemorrhoid to rupture and bleed, and during or after defecation, there is dripping, or even jet-like bleeding with bright red blood, which may be accompanied by a swelling coming out of the anus.
2.Anal fissure. Anal fissures are usually caused by constipation, due to dry stool and abrasion. When the condition is mild, bleeding is less, and when the condition is serious, bleeding is more.
3, colon and rectal polyps. Colon and rectal polyps: characterized by painless blood in the stool and no special discomfort for the patient. Usually blood will be found outside the stool after the stool, not mixed with the stool.
4, rectal cancer or colon cancer. Rectal cancer has chronic diarrhea or recurrent mucus-purulent blood-like stools, accompanied by urgency, the feeling of incomplete defecation and increased number of stools, should consider the possibility of rectal cancer. Patients with colon cancer may have thin stools and stools with mucopurulent blood should be suspected of the possibility of colon cancer, a few patients may only show fixed abdominal pain, bowel cancer is easily considered by patients as hemorrhoids, not enough attention, thus delaying treatment.
5.Inflammatory bowel disease. Pus and blood stool or bleeding mixed with mucus during stool, usually accompanied by abdominal pain, frequent stool and other symptoms.
6, serious intestinal infectious diseases: enteritis. Such as enteritis, with a history of unclean food, often accompanied by severe diarrhea, fever, shortness of breath, abdominal distension, abdominal pain and other manifestations.
7, rare disease: rectal endometriosis rectal endometriosis is the pathological state caused by the invasion of endometrial cell tissue into the rectum. In addition to menstrual abnormalities, dysmenorrhea, painful intercourse, infertility and other common symptoms of endometriosis, patients with rectal endometriosis also have symptoms such as painful stool, diarrhea, periodic blood in stool, a feeling of urgency, and a feeling of incomplete bowel movement. It needs to be distinguished from rectal cancer.
8.Other blood system diseases. Such as leukemia, aplastic anemia, primary thrombocytopenic purpura, hemophilia, disorders of coagulation mechanism, collagen disease, uremia may lead to blood in the stool.
9. Other rare diseases. Such as intestinal diverticulum bleeding, KT syndrome (anorectal hemangioma), schistosomiasis, infectious diseases such as plague, typhus, etc., may lead to blood in the stool.