Stress is terrible.

Work overloaded me and caused so much stress that I had stress-induced alopecia. My beard fell out in patches, and I had random patches of hair fall out on the back of my head, almost like perfect circles. Besides that, I couldn't really enjoy myself anymore, and I would often spend my non-work time vegetating.

Then there's the teeth grinding and all the damage that comes with that.

The hair came back, but the damage done to my teeth is not reversible.

These are just the physical damages, the damages to mental health are either still on the mend or scarred.