Your post is rather timely geez because I just went for my physical and it turns out that I might have some thyroid issues. They withdrew more blood for testing and I'll find out soon. But as soon as he said "thyroid" I asked him about depression. (He knows about it) He said it maybe, but we'll have to see the results of the test.

I've wondered the same thing... if thyroid-related depression is the same as chemical imbalance/situational depression. I wish I knew. The way I see it, whether depression is a result of a chemical imbalance, a thyroid issue, situational, etc... there is always a solution. Knowing the cause helps to treat it. But I'm glad your friend is getting the right treatment.