頭が痛い。
Words
頭
(あたま、かしら)
head; hair (on one's head); mind; brains; intellect; leader; chief; boss; captain; top; tip; beginning; start; head; person; top structural component of a kanji
が
(が)
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
痛い
(いたい)
painful; sore; exceeding