Thrombosed external hemorrhoids are a type of external hemorrhoids, and how long it takes for them to go away depends on the severity of the patient’s condition and the treatment method. Thrombosed external hemorrhoids manifest as a swelling outside the anus, which is painful in the acute phase and can be caused by a blood clot causing blood to pool in the vein or by a rupture in the vein and blood seeping under the skin and coagulating into a thrombus. In the acute stage (within 48-72 hours of onset), thrombosed external hemorrhoids can be treated by surgical excision if the pain is severe, and the surgical incision will gradually recover in about 2 weeks. When the thrombosed mass is formed for more than 72 hours, but the pain is not severe, conservative treatment with medication can be chosen and the thrombosed mass usually disappears in about 1-2 weeks. Thrombosed external hemorrhoids can be cured with surgery, but most patients can achieve relief with conservative treatment. It is important to note that thrombosed external hemorrhoids have a risk of recurrence, and if a healthy lifestyle and diet are not observed even after cure, a recurrence may occur.