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

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

in which I looked up
the REACTION rates
The Big Bang Theory Season 7, Episode 6

Given the REACTION to my costume...
The Big Bang Theory Season 1, Episode 6

If the two of you engage in intercourse,
this will create the biochemical REACTION...
The Big Bang Theory Season 2, Episode 9