Hi!
I fully believe that there are genetic components and that within the next 20 years what we know aboult bipolar and a lot of other mental illnesses will be much better understood as a biological thing rather than "it's just in your head" thing. I think there are some great research things going on right now leading us in that direciton.
I also believe there are environmental factors. So, even in families not everyone will have bipolar. But, I believe there is a connection to other illnesses and it's really more of a spectrum than isolated islands. So, you could see a wide variety of different things within a family.
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