I think of all of the "extroverts" who commit suicide and everyone comments on how happy they seemed. Introverts probably don't try to hide it while extroverts "put on a brave face" That said while I am introverted I can also be extroverted and am very good at hiding how I feel.

I don't know about that. My depression sometimes results in introversion, but it's definitely not caused by it. It's mostly caused by what other people choose/have chosen to do.

I think it would be more telling, if they were to have some data that showed the number of depressed introverts as a percentage of the depressed population as a whole.

I wonder if the people who label others as depressed are introverts or extroverts, and if that may subtly affect their diagnosis?

I have an auto immune thyroid disorder, where I was depressed and felt a great of social anxiety before it was diagnosed and treated. My daughter has the same issue (thanks dad), only hers was far more severe than what I experienced.

In general , the depression I've felt , was due more to the people in my life , than to the fact that I chose not to have more people in my life . I've been much happier , since I removed my mother-in-law and husband from my life . Noting the many on this site who are divorced , I'd suggest that isn't uncommon . Since , as a married woman , we spend most of our after work time at his mother's house , I discovered I didn't have friends once we separated . I had to learn how to go out and make friends , a very slow process for many of us .

I think for me I have a lot more social anxiety than depression. I agree with you about everyone going through bouts of depression. Unless you're Mary freakin Poppins lol