This is an irregular verb. It follows the conjugation pattern of the verb sentir.
PresentPresente
A veces las bromas hieren a los amigos.
Sometimes jokes hurt our friends.
PreteritePretérito indefinido
Sin querer, herí a mi amiga con mis palabras.
Without meaning to, I hurt my friend with my words.
Negative ImperativeImperativo negativo
Por favor, no hieras los sentimientos de tu hermana.
Please don't hurt your sister's feelings.