[elpachuco]

Stress increases your blood pressure, releases adrenaline, and forces your body to go into overdrive. Chronic stress will wear down your body faster.

Simple analogy: Drinking acidic fluids will wear down your enamel. Do it for a long time and eventually all of your enamel will be gone. That will cause lots of other problems.

Feeling "bad" i.e. stress, is probably wearing something down inside your brain. Once that "something" is gone lots of problems occur. Schizophrenia may be the result of that "something" being worn out.