Internal hemorrhoids mainly refer to soft venous masses that occur above the dentate line, formed by congestion, dilation, and varicosity of the superior rectal venous plexus. The primary symptoms are rectal bleeding and prolapse of the lump outside the anus. Prolapse of internal hemorrhoids is one of the indications for surgery, meaning that if there is rectal bleeding or prolapse outside the anus at the dentate line, surgical treatment is required. Thus, internal hemorrhoids are considered severe if there is a prolapse, necessitating surgical treatment.