Anal thrombus is mostly thrombosed external hemorrhoids, which can be manifested as severe pain in the anus, obvious foreign body sensation, seriously affecting daily life, and perianal infections can occur if not actively treated. Anal thrombus refers to thrombus or venous rupture in the perianal subcutaneous formation of lumps, mostly sudden onset of the disease, manifested as intense pain in the anus, a foreign body sensation, pain is unbearable. If the swelling surface erosion, can be accompanied by blood in the stool, seriously affecting the quality of life as well as daily activities, if not actively treated can develop to the perianal skin infection, eczema, etc., is serious. If after active treatment, thrombosed external hemorrhoids can be treated well, this case is not serious, but still need to pay attention to avoid recurrence. Once the anal thrombosis should be timely consultation, clear condition, actively give targeted treatment, and at the same time to develop good habits, keep defecation, avoid sitting, squatting, diet should be more light and nutritious diet, drink more water, appropriate exercise, etc..