[habinero]

That's only because we have no way to measure it, not because it's not also a physical problem.

[thfuran]

Also, it's really not the case that non-mental diseases have categorically clearer diagnostic criteria.

[improv]

>That's only because we have no way to measure it, not because it's not also a physical problem

People say the same thing about God.

Measurability is a fundamental requirement of science for something to be tested or studied systematically.