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Is it possible for men to lactate and grow breasts? Yes. And it is more likely to happen to us than it is for many other mammals. Beer can cause enlarged breasts in men and some of the medication you might be taking could have side effects that cause you to start leaking out your nipples.
Does this mean you might start having to wear a bra or squirting out milk out of the blue? Probably not, but here is the reason some men may end up lactating, or having man boobs and others don’t.