Hemorrhoids are soft venous masses formed by dilatation and flexion of the venous plexus under the mucous membrane at the end of the human rectum and under the skin of the anal canal. They are most often seen in people who stand a lot and those who are sedentary. So what are the dangers of hemorrhoids? A. Anemia: One of the main symptoms of hemorrhoids is blood in the stool, repeated bleeding in the stool can cause the body to lose a lot of iron, causing iron deficiency anemia, which is because under normal circumstances the absorption and excretion of iron remains in balance, and the loss of iron is very short. Normal adult men do not lose more than 2 mg of iron per day, while patients with blood in the stool lose more than 3-4 mg if the daily blood loss exceeds 6-8 ml. Normal human male contains a total of 50 mg of iron per kilogram of body weight, if long-term blood in the stool, the loss of a large amount of iron, so that the total amount of iron in the body is lower than normal, can cause iron deficiency anemia. One of the most important symptoms of hemorrhoids is blood in the stool Second, necrosis: hemorrhoid nucleus embedded in the anus, due to a series of pathological changes so that the accumulation of local metabolites, further aggravated the local edema of the anus aggravated the embedded hemorrhoid nucleus. This is a vicious circle, so internal hemorrhoids embedded for a long time must appear necrosis, at this time the necrosis is often limited to the mucous membrane part of the hemorrhoid nucleus, but there are also cases of invasion of other parts of the body. The infection: after the hemorrhoid nucleus is embedded, there are different degrees of infection patients appear urgent and then heavy, the anal chasing feeling obvious and other symptoms, at this time the infection is mostly confined to the anal local, if the strong reset easy to make the infection spread, causing submucosal perianal or sciatic rectal fossa abscess. There have been reports of fatal portal vein sepsis associated with embedded hemorrhoids abroad. The hemorrhoid is prolapsed and is held outside the anus by the sphincter muscle. The venous reflux is blocked while the arterial blood is still being input, causing the hemorrhoid to increase in size to the point where the arterial blood vessels are pressed shut and a thrombus forms. The traditional view is called “strangulated internal hemorrhoids”, but clinically it is more common to see external hemorrhoids with thrombus formation and therefore more painful, when the hemorrhoid nucleus is prolapsed and cannot be returned it is also called “embedded hemorrhoids”, and prolonged embedded hemorrhoid nucleus can also appear lesions.