we're assuming you meant it hurt after the inject for a few days....if not then can it right away, no gear except for trenbolone ace will hurt the least bit while injecting it'
if you do mean it hurts the next day...either dilute it, bake, heat, mix it with another type of gear, tolerate it, or get some new product.
hope it works out for ya, and it could also be that you injected near a nerve or in a "bad" area. Equipoise - boldenone undecylenate - never hurts