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Sprained nickelboob
Sprained nickelboob is a slightly uncomfortable condition of the human nickelboob. The nickelboob is that triangle-shaped, nickel-like indentation centered smack dab between the boobs. Also known as the xiphoid or xiphoid process, it’s where your ribs connect to your sternum. If you twist or reach the wrong way, it can get tore up. If it does, it hurts a little bit. Not enough to totally wreck your day, but enough to make you want to complain about it.
In some circles, sprained nickelboob is also known as costochondritis. Those circles are typically hella nerdy, the kind doctors run in.

I call this “human nickelboob.” Others call it “Xiphoid process frontal” by Anatomography – Licensed under CC BY-SA 2.1 jp
Causes
Moving in a funny way that your body doesn’t like. It could be just one funny movement or a lifetime of funny movements. I guess you could get it if you have a cold and you’re coughing like crazy. Or you could get it if you’re way too hard on your nickelboob in general. There are probably lots of causes. I don’t know like I said I’m not a doctor.
Symptoms
Painful nickelboob, especially when you move funny or someone pushes down on it really hard (a doctor, for instance). I recently sprained my own nickelboob and goddamn did a doctor push the crap out of it.
When to seek medical care
Here’s the deal: If it’s really just a sprained nickelboob/costochondritis, a doctor’s visit is probably overkill. You’ll be told to apply ice and heat to it and to take over-the-counter pain medication to reduce discomfort. It’ll probably heal pretty quick and you’ll be back to pain-free nickelboobing.
That said, a hurty chest is a symptom of a lot of scary health conditions and it’s best to know whether or not you’ve got any of them. A doctor will check all your vitals to make sure business is in good working order. They’ll want to make sure that you’re breathing fine and that your legs aren’t swollen, numb, or otherwise acting kookily. They’ll also want to make sure you’re not feeling nauseated or feverish. They’ll take care of you. It’s never a bad idea to have a doctor check a hurty chest.
Cures
Time. Time heals all nickelboobs.