I'll try to keep this as short as I can. I'm a 22 year old male, 5'8, about 140 pounds. When I was around 13-14 I started developing severe stretch marks all over my body (knees, waist, back, shoulders, arms). When I finally went to see a doctor about them many years later, I was told by the doctor that she had never seen stretch marks that severe and referred me to a dermatologist. The dermatologist was also shocked by them and couldn't determine what could be causing them. I had a blood test for coritsol that was "slightly elevated" and was then referred to an endocrinologist who ran further tests to see if I had Cushings, and he said that I didn't (his explanation for the stretch marks: "some people get them and we don't know why." Right.)
I've done a lot of research on the internet about stretch marks and I don't fall under any of the common categories of people who get them: I was never overweight, I never grew that quickly (I'm only 5 foot 8 as an adult), I never lifted weights or took any kind of steriods or steriod-based medications for anything.
However, I have had a lot physical/mental issues since I first noticed the stretch marks. Pretty much constant depression/anxiety; frequent dizziness and muscle twitching/spasms around the time that the stretch marks started to appear, although that later went away. Right now I suffer from a bunch of things like hyperhydrosis (severe sweating under the arms), poor memory/concetration, frequent fatigue and recently I've noticed new hair growth on my body (which my doctor told me was normal, but I can't help but think it's odd since I'm well past puberty).
Anyway, I can't help thinking that this is some sort of hormonal issue. I know severe stretch marks are associated with Cushings, but if I don't have Cushings then I don't know what else could have caused the severe stretch marks (and probably some of the other conditions I've had over the years).