Anal thrombosis, also known as thrombosed external hemorrhoids, is often caused by excessive diet of spicy and irritating foods, excessive straining during bowel movements, resulting in the rupture of the subcutaneous blood vessels around the anus, producing subcutaneous bruising of the anus and producing a thrombus. It is mainly painful, and the pain is more obvious in the early stage, and usually the pain will gradually decrease after three days. The main methods of treatment for thrombosed external hemorrhoids are conservative treatment and surgical treatment. Conservative treatment mainly includes oral medication, topical medication, Chinese herbal medicine or external washing of Chinese medicine. The surgical treatment is mainly a simple thrombosed external hemorrhoid dissection, which is to make a small incision in the swelling to dislodge the thrombus, the swelling and pain around it will disappear, and the circulation will slowly recover and heal well.