If hemorrhoids are caused by intestinal parasites weakening the tissues, and you don't get rid of them, it could eventually lead to anal fissure, abdominal fistula, and the need for surgery.
Enemas and suppositories are a lot less invasive than a colonoscopy and/or colorectal surgery.
The doctors will be happy to cut you a new BH without ever telling you what caused the old one to wear out, because then you will become a regular customer. The pathogens will find a new spot inside you and recolonize, eventually perforating your guts beyond repair. My aunt and grandmother both died from this.