As the saying goes, “nine out of ten hemorrhoids”, which means that the incidence of hemorrhoids is very high, but also because of its high incidence, many patients do not pay attention to it, and many hemorrhoid patients come to the clinic only because of severe anal pain, and some of them are patients with thrombosed external hemorrhoids. Thrombosed external hemorrhoids are a common type of external hemorrhoids, characterized by sudden and severe pain in the anus and the formation of dark purple masses. Definition A thrombosed external hemorrhoid is a round swelling caused by a ruptured external hemorrhoidal vein that bleeds, blood clots under the skin, and a thrombus forms. Etiology Thrombosed external hemorrhoids are often caused by the rupture of the perianal subcutaneous veins and the accumulation of blood under the skin due to excessive consumption of spicy and irritating foods, straining at the toilet, or forceful weight-bearing. Generally speaking, the common causes of thrombosed external hemorrhoids include sedentary, standing, low activity, constipation, diarrhea, long defecation time, excessive alcohol consumption, spicy food, and forceful weight-bearing. Clinical features The main complaint is that the patient feels swelling, pain and foreign body sensation in the anus, and the pain is sudden and severe at the beginning of the disease. Treatment 1.Conservative treatment The small thrombus can be treated conservatively by using traditional Chinese medicine fumigation, hot towel compress, warm water sitz bath, etc., along with certain oral medicine treatment, such as the use of Maizi Ling tablets to reduce swelling, or oral diclofenac potassium and other painkillers, etc. 2.Surgical treatment External hemorrhoid removal can be used for those who have poor results of non-surgical treatment and obvious pain; thrombosed external hemorrhoids are large, the clots are not easily absorbed, and the inflammation and edema are limited. Prevention 1.Eat less spicy and stimulating food, eat more fresh vegetables and fruits, pay attention to drink more water, and exercise more in general. 2.Cultivate good defecation habits, keep the bowels open, and avoid excessive force during defecation. 3, timely treatment of anal inflammatory diseases. 4.Keep your mood relaxed. 5, pay attention to the cleanliness of the anal area, after the stool can be flushed with water, or use baby wet wipes.