Should you worry if your nipples point inward?

Some things in life are absolutely certain: The sky is blue, Chris Evans is the best Hollywood Chris, and nipples always point outward...right?

Yes, definitely, to the first two—but as for the nipples thing? Maybe not. You see, while most nipples point outward (hello, headlights), it's totally possible for some types to, uh, retreat back into the breast.

Sometimes, it's totally NBD (you were born that way, baby); but other times, your nips might be trying to tell you something big is up—and you'd better listen.