1
general::
Also, too close to home. Dangerously nearby or accurate, as in That last shot was too close for comfort, or Their attacks on the speaker hit too close to home, and he left in a huff.
American Heritage Idioms
2
general::
Phrase(s): too close for comfort
Cliché [for a misfortune or a threat] to be dangerously close. • That car nearly hit me! That was too close for comfort. • When I was in the hospital, I nearly died from pneumonia. Believe me, that was too close for comfort.
McGrawhill's American Idioms And Phrasal Verbs