Dark red blood from hemorrhoids is caused by ruptured hemorrhoids. Hemorrhoids are soft clusters of veins formed by the expansion and flexion of the venous plexus under the mucous membrane at the end of the rectum and under the skin of the anal canal of the human body; when defecating, especially when constipated, the veins within the hemorrhoidal nucleus are subjected to an increase in pressure, and they are prone to rupture and bleed. As hemorrhoids are venous masses, the venous blood contains little oxygen, so the blood flowing out appears dark red; bleeding can appear dark red drops when bleeding a small amount, and when bleeding a large amount of blood, the blood can be in the form of jets; prolonged bleeding may lead to chronic anemia of the patient. It is recommended that patients should consult the doctor in time when hemorrhoids bleed, clarify the condition under the doctor’s guidance, and give targeted treatment as early as possible; it is also recommended that patients should eat more fresh vegetables and fruits, develop the habit of regular defecation, avoid dry stools and constipation, reduce the time of defecation, and do more exercise.