Sudden bleeding in the stool without pain may be a symptomatic manifestation of some diseases such as hemorrhoids, ulcerative colitis, bleeding in the upper gastrointestinal tract, etc. These diseases can lead to bleeding without obvious pain.
1. Hemorrhoids: mainly internal hemorrhoids and mixed hemorrhoids, due to straining to defecate, dry stools, resulting in capillary rupture, blood in the stool, but no obvious pain.
2. Ulcerative colitis: patients will have ulcers of the colonic mucosa, or congestion and edema, which will be discharged with the stool.
3. Upper gastrointestinal bleeding: such as gastric ulcer, duodenal ulcer, etc., the color of blood in the stool is black or tarry stool.
In addition, bleeding in the stool can also be seen in other diseases, specific should go to the regular hospital for clear diagnosis and treatment.