What causes constipation with blood?

Constipation with blood may be due to hemorrhoids, anal fissure, colon cancer and other diseases caused. 1. Hemorrhoids and hemorrhoids may be caused by factors such as perianal varicose veins and anal pad depression. Poor defecation habits and low fiber diet may also induce this disease. Due to pain in defecation, patients will endure stool and not discharge, resulting in water absorption in stool by intestinal tract and constipation. When dry fecal mass is discharged from the body, it may cause friction to hemorrhoids. 2, anal fissure anal fissure may be due to anal stenosis, anal sphincter spasm and other factors, due to defecation will lead to anal pain, patients will appear to endure stool phenomenon, stool retention in the intestinal tract for too long, will be caused by stool dry knot, resulting in constipation, defecation due to anal skin rupture, will lead to hematochezia. 3. The specific cause of colon cancer is unclear, which may be related to improper diet, heredity, exposure to carcinogens and other factors. Due to the existence of cancer focus in intestinal tract, patients will lead to intestinal stenosis, which will make stool stay in intestinal tract for a long time, resulting in constipation. When stool rubs cancer focus, it will also lead to blood in stool.