ここが痛い。

here (place physically close to the speaker, place pointed by the speaker while explaining); this place; these last (followed by a duration noun and a past sentence: time period before the present time of the speaker); these next ... (followed by a duration noun and a non past sentence: time period after the present time of the speaker); the next ...

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

painful; sore; exceeding