What's the difference between acıyor and ağrıyor?
acımak is used for wounds / injuries (does it hurt?). ağrımak is used for internal pain ("my head/belly/chest/etc aches") and psychological (love hurts)
Same question
"Does it hurt much?" is used synonymously in english, but isn't accepted.
Just a missing alternative. Added.
Why not hurtS?
does + verb (either in a statement "it does (not) + verb" or in question form: "does it + verb") requires the verb in infinitive form in English.
See: https://www.grammar.cl/Present/Do_Does.htm