1, upper gastrointestinal diseases: peptic ulcer and esophageal varices can cause hematochezia in upper gastrointestinal diseases. When these diseases occur, the stomach and esophagus will bleed. When the amount of bleeding is large, dark red bloody stool will appear after being discharged from the anus;
2. Lower digestive tract diseases: bloody stools caused by lower digestive tract are common in clinic, mainly including ulcerative colitis, bacillary dysentery, hemorrhoids, anal fissure, colon or rectal polyp, rectal cancer, colon cancer and Crohn's disease. This is usually related to bad defecation habits, inflammation and repeated stimulation of cancer cells. Long-term rectal irritation may cause bloody stool;
3. Intra-abdominal vascular occlusive diseases: such as portal vein thrombosis, thrombosis will occur when blood circulation is not smooth, and strangulation necrosis will easily occur when thrombus blocks blood vessels, leading to severe abdominal pain and bloody stool.
Clinically, blood can be bright red or dark red, and it cannot be diagnosed as a disease by blood alone. For female patients with fecal bleeding, they need to go to the gastroenterology department of the hospital for treatment, and a professional doctor will make a preliminary judgment according to the medical history and other symptoms, and take gastroscope, colonoscopy, etc. Symptomatic treatment is required.