It is said that nine out of ten men have hemorrhoids, and it is not uncommon for women to have them as a clinical category. We’ll take a look at the classification of hemorrhoids and their respective characteristics today. Hemorrhoids are divided into three categories: internal, external and mixed hemorrhoids, based on the dentate line and below. The symptoms of each type of hemorrhoid are different, and the clinical diagnosis is based on different criteria. As mentioned above, internal hemorrhoids and external hemorrhoids are divided by the dentate line, so what is the dentate line? In the area where the skin of the anal canal meets the mucosa of the rectum, a serrated annulus is formed by the edge of the anal flap and the lower end of the anal column, called the dentate line. Internal hemorrhoids occur above the dentate line and are characterized by painless intermittent bleeding, bright red, dripping or squirting blood, and prolapsed hemorrhoids as the main symptom. According to the prolapsed hemorrhoid, there are four stages: Stage I: Painless blood in stool is the main symptom, blood is not confused with stool, no prolapse, bleeding can stop by itself after stool. Stage II: Blood dripping or spraying during stool, with prolapsed hemorrhoid nucleus, which can be retracted by itself after stool. Stage III: Blood or dripping blood in the stool, bleeding has decreased, the nucleus of the hemorrhoid is prolapsed and requires external force to retract, when the patient stands and squats for a long time, coughing, exertion, weight bearing, etc. the nucleus of the hemorrhoid will prolapse again. Stage IV: The nucleus of the hemorrhoid is prolapsed for a long time and cannot be retracted, which can be accompanied by symptoms such as strangulation, impaction and pain. External hemorrhoids occur in the anal canal below the dentate line and at the edge of the anus. The surface of external hemorrhoid is covered with skin, which can be seen or touched, and the nucleus cannot be sent into the anus, which is not easy to bleed. The main symptoms are pain, foreign body sensation, and anal cramping, which are clinically classified into four types: 1. Inflammatory external hemorrhoid: often caused by skin injury and infection at the anal margin. The skin of the anal verge protrudes from the wall like a blister. The swelling and pain are obvious. 2. Thrombosed external hemorrhoids: The anal venous plexus ruptures and blood leaks out of the blood vessels, forming a thrombus that bulges under the skin. It is characterized by sudden onset, local swelling and severe pain. 3.Connective tissue external hemorrhoids: due to chronic inflammatory stimulation, repeated inflammation and swelling, resulting in the skin folds of the anal margin becoming larger and the connective tissue proliferating, forming skin pendulous of varying sizes. 4.Venous varicose external hemorrhoids: subcutaneous varicose vein mass around the anal verge, which increases when squatting abdominal pressure and enlarges when defecating, and the symptoms can be reduced to different degrees after resuming normal position. Mixed hemorrhoids Mixed hemorrhoids occur above and below the dentate line in the same direction of the anus. Painless intermittent bleeding after stool, mainly dripping blood, in the middle stage there will be hemorrhoid nucleus prolapse, followed by pain, cramping and other symptoms; in the later stage, due to long-term prolapse of hemorrhoid nucleus and anal sphincter relaxation, there is often secretion, and the secretion stimulates the perianal area can cause anal itching or perianal eczema. Clinical symptoms of both internal and external hemorrhoids.