Repeatedly counting objects,checking locks, or clenching your handsa specific number of...

[narrator] OCD is famous for its rituals: repeatedly counting objects,
checking locks, or clenching your hands
a specific number of times. It's all driven by the fear
that something bad will happen if you don't do the ritual right. Where do all these anxiety disorders
come from? Well, some of it is inherited. If you have a parent with anxiety,
you're more likely to be anxious yourself. And women are up to two times more likely
to have an anxiety disorder than men. Anxiety also seems to have something to do
with the balance of chemicals in your brain. [Sapolsky] Probably the most famous one
these days is serotonin