YOU SAID:

My uncle's arm hurts really bad.

INTO JAPANESE

叔父の腕がひどく痛い。

BACK INTO ENGLISH

My uncle's arm hurts a lot.

INTO JAPANESE

叔父の腕がとても痛い。

BACK INTO ENGLISH

My uncle's arm hurts very much.

INTO JAPANESE

叔父の腕がとても痛い。

BACK INTO ENGLISH

My uncle's arm hurts very much.