
That's tissue inflammation.
It's a REACTION to your radiotherapy.
Breaking Bad Season 2, Episode 9

Leonard, what if you have
an allergic REACTION...
The Big Bang Theory Season 8, Episode 9

My friend
is having allergic REACTION to peanuts.
The Big Bang Theory Season 1, Episode 16

Yeah, my initial REACTION is no.
The Big Bang Theory Season 2, Episode 22

For every action,
there's an equal and opposite REACTION.
The Big Bang Theory Season 2, Episode 22