Why do boobs hurt when you are almost on period or on it?

Deathcabforcutie
Girls is that the same for you? My boobs are so sensitive and swollen. I thought that was only when you're pregnant?! Any scientific explanation? Or other girls with this super annoying issue? Also why do we get bloated? (Might as well ask while I'm at it)
Why do boobs hurt when you are almost on period or on it?
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