I have always had very thick hair -- was a 10lb baby w/ full head of hair, looked like a 3MO, my mom says.
After each of my surgeries (4 or 5), I've had hair loss, even at age 17. Each time, hair has grown back. I was having some hair loss B4 my MVR, but my hairdresser said my hair was still very thick; I've gone to him for 24+ years, so he should know what my hair is like.
I may be going through some hair loss; after all, I'll be (gulp) 54 in 2MO. I had it cut short, shorter, even shorter in several stages after my MVR. Feels very very thick now.
I'm not sure I'd attribute any hair loss I've had since my surgery to Coumadin.