Hemorrhoids are soft masses formed by the expansion and flexion of the mucous membrane of the human rectum and the subcutaneous venous plexus of the anal canal. They are also called hemorrhoids, hemorrhoids, and hemorrhoids. In traditional Chinese medicine, hemorrhoids have broad and narrow meanings. "Medical Gangmu" "There are hills protruding into hemorrhoids in the Daze. People in the nine orifices, where there are small protruding flesh, they are hemorrhoids, not only on the anus." It means that there are at the junction of the nine orifices of the human body and the skin. Protruding lumps are collectively called hemorrhoids. "Wonderful Prescription for Intestinal Piping Hemorrhoids and Leaking Prescriptions" "Hemorrhoids are born in the anus...Some are like mouse milk, and some are like cherry...". That is, the diseases that occur inside and outside the anus are collectively called hemorrhoids. In a narrow sense, hemorrhoids are soft masses formed by the expansion and flexion of the submucosal and subcutaneous venous plexus of the anal canal. They are classified into internal hemorrhoids, external hemorrhoids, and mixed hemorrhoids.
Hemorrhoids are a frequently-occurring and common disease. As the saying goes: "Nine hemorrhoids in ten people" means that the incidence of hemorrhoids is very high. According to the National Survey of Anorectal Diseases in 1977, hemorrhoids accounted for 87.19% of the incidence of anal diseases. Hemorrhoids can occur at all ages and gradually increase with age.