[numakerg]

> Symptoms among others include anxiety, depression and irritability.

It wasn't until the late 1800s that the miasma theory of disease was overturned in acceptance by germ theory. At some point in the next century, computers will become powerful enough to closely simulate the entire human body. We'll be able to hook up our bodies and compare them to a common model in a sort of "debugging" process. I think what we'll find is a diverse host of viruses and parasites, or other curable abnormalities that are responsible for mental health problems.