Eli5: why is there no test for the “chemical imbalance” that is often mentioned for depression?
In: Chemistry
Because it all happens in your brain, and it’s hard to see what’s going on in there. A lot of medical stuff can be identified by taking out fluids from the body and testing them, but it’s really dangerous to go into the brain. As a result, you have to diagnose by looking at secondary stuff, like behaviour.
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