At first I thought she was cranky
because of her horrific MENSTRUAL cramps,
The Big Bang Theory Season 10, Episode 16
...and MENSTRUAL cramps.
The Big Bang Theory Season 4, Episode 21
Where are you in your MENSTRUAL cycle?
The Big Bang Theory Season 2, Episode 9
Uni, bi, tri, MENSTRUAL,
all cycles are dumb.
The Big Bang Theory Season 10, Episode 22