Why does it seem like so many women have depression, anxiety, bipolar, and/or PTSD?

This is purely anecdotal, but I feel like a LOT of women in my life have mental illnesses of one kind or another. Lots of depression, lots of anxiety, some bipolar mixed in there, lots of PTSD.

Have other people noticed this? What's the deal?

Why does it seem like so many women have depression, anxiety, bipolar, and/or PTSD?
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