Because theyre caused by veins being pushed out of the 'area' lol (couldnt think of a good word) the sphincter muscle (i think thats the muscle im refering too) can stop them from moving back inside.. they may requiring pushing (yes sounds fun lol).. thats what my doctor told me anyway

Also.. going to the toilet whenever you feel the urge.. not waiting!

I know theres more to it.. but i cant remember right now..

Kirby