The scientific name for hemorrhoids in clinical practice is hemorrhoids, and hemorrhoids are divided into external, internal and mixed hemorrhoids, and these 3 are also the scientific names for various types of hemorrhoids respectively. Internal hemorrhoids are located above the rectal tooth line and the main symptom of internal hemorrhoids is blood in the stool, which is characterized by painless intermittent blood in the stool and the prolapse of the hemorrhoid nucleus during the stool. External hemorrhoids are located below the dentate line and are classified as varicose veins, connective tissue hemorrhoids, inflammatory hemorrhoids and thrombosed hemorrhoids. When there are both internal and external hemorrhoids in the same spot around the anus, it is called mixed hemorrhoids, and mixed hemorrhoids have the clinical manifestations of both internal and external hemorrhoids.