Learn English – An idiom for a very sensitive person

idioms

Is there an idiom for describing someone who is oversensitive (emotionally, not physically)?

I vaguely remember something along the lines of "he is all exposed nerves".

Best Answer

to be a bundle of nerves
to be wound too tight [sic]
high-strung
too tense

Then there are loads of these types:

Nervous as a long-tailed cat in a room full of rocking chairs
Nervous as a porcupine in a balloon factory

etc.