It hurts! (ah-pah-yo)
Listen at 1:18 to hear the word pronounced!
Things that can hurt:
Head - 머리 (meo-ri)
Heart - 마음 (ma-eum)
Foot - 발 (bal)
Ear - 귀 (kwi)
Body - 몸 (mohm)
Eyes - 눈 (noon)
Now if the thing that hurts ends in a VOWEL you need to add "가" (gah)
If it ends in a CONSONANT you need to add an "이" (ee)
눈이 아파요 - My eyes hurt (noon-i apayo)
머리가 아파요 - My head hurts (meo-ri-ga apayo)
It's just the way Korean works :)
If you speak Spanish, think of it like how you don't say "...y ingles" you'd change the "y" to "e" just cause it sounds better!