Thrombosed external hemorrhoids break on their own after a few days, may be due to improper diet and dress, constipation or local inflammation and other reasons. 1. improper diet and dress: patients in the daily consumption of spicy and stimulating food, resulting in external hemorrhoids by capsaicin and other stimulation, or wear clothing too tight and rough, easy to cause thrombosed external hemorrhoids by friction, may cause hemorrhoid surface ulceration. 2. constipation: patients with constipation will cause difficulty in defecation, defecation force, stool dryness and so on, easy to cause hemorrhoids ulcerated. 3. local inflammation: thrombosed external hemorrhoids will lead to inflammation in the anal area of the patient, and the emergence of pus, with the accumulation of pus, skin pressure will lead to thrombosed external hemorrhoids, ulceration occurs. Thrombosed external hemorrhoid patients once found, should be timely to the regular hospital for diagnosis and treatment, to avoid delaying the aggravation of the condition.