That's tissue inflammation.
It's a REACTION to your radiotherapy.
Breaking Bad Season 2, Episode 9
No visible REACTION.
The Big Bang Theory Season 7, Episode 5
I guess I was hoping for a
different REACTION, but okay.
The Big Bang Theory Season 5, Episode 19
...the success or failure of the date would
be based on the biochemical REACTION...
The Big Bang Theory Season 1, Episode 3