Prolapse of internal hemorrhoids refers to the condition where the hemorrhoidal mass of internal hemorrhoids protrudes outside the anus. This condition occurs only in internal hemorrhoids of grade II or higher. Grade II internal hemorrhoids can spontaneously retract back inside the anus after defecation without the need for manual reduction. Grade III internal hemorrhoids, however, do not retract spontaneously and should be manually reduced after cleaning and a period of bed rest. If the hemorrhoids remain prolapsed for a long time without timely reduction, it can lead to painful swelling around the anus. If a patient is unable to manually reduce the prolapsed hemorrhoids themselves, it can lead to incarcerated hemorrhoids, and medical assistance should be sought promptly.