The most common is "Are you OK?" "Are you hurt?" is definitely correct as well, but it might feel a little formal depending on context. "Does it hurt?" is also natural, but it would be in reference to a specific body part or motion. I hope this helps!

They have slightly different meanings. "Are you hurt?" means "Are you injured?" ( The word 'hurt' is a past participle here) "Does it hurt?" means "Is it painful?" ( In this case, we would need to know what 'it' is).

letter A