Stress can cause major pain. Have you never heard the muscles in your neck and shoulders called "stress muscles"?

And I've been in the position of answering the telephone and hearing some absolutely horrible news and it turned my bowels to water. I'd never believed it possible.

When we were having trouble with the IRS last year, a letter from the IRS would have me in the bathroom all afternoon and evening.

Not to mention a that awful headache that only stress can cause.