Many gastrointestinal diseases and some systemic diseases can cause stool bleeding, which is the most common clinical symptom. The diseases that can cause blood in the stool are summarized as follows:
1. Digestive tract diseases
(1) Anal diseases: such as hemorrhoids, anal fissure, anal sinusitis, anal fistula, anal cancer, etc.
(2) Colorectal diseases: such as colorectal cancer, colon polyps, rectal polyps, colorectal polyposis, colorectal vascular diseases, colonic diverticulitis, chronic ulcerative colorectitis, radiation proctitis, colorectal tuberculosis, bacillary dysentery, amni Barbaric dysentery, Crohn’s disease, schistosomiasis, intussusception, rectal prolapse, etc.
(3) Small bowel diseases: such as acute necrotizing enterocolitis, pseudomembranous enteritis, enteric typhoid fever, etc.
(4) Upper digestive tract diseases: such as gastric and duodenal ulcers, gastritis, ruptured varicose veins at the lower end of the esophagus, esophagitis and tumors of the esophagus, stomach, duodenum, liver and gallbladder, etc.
2. Systemic diseases
(1) Blood diseases: such as leukemia, thrombocytopenic purpura, hemophilia, aplastic anemia, etc.
(2) Vitamin C deficiency and vitamin K deficiency, etc.
(3) Certain infectious diseases, sepsis, urinary poisoning, etc.