Throwing up is a complex bodily reaction that forces the contents of your stomach to leave the body. You might vomit because your digestive system detects something bad in your food. Or you might throw up in response to signals from your brain, balancing systems in your ears or bloodstream, which can contain medicines or infections that spur nausea.
Your stomach contains powerful acids that help break down food. And some of this sour-tasting gastric juice gets pumped up and away when you puke. Although a wave of spit and mucus helps protect your throat and mouth when you vomit, you’ll still feel the burn. Particularly forceful barfing sessions will propel puke into your sinuses and out your nose, producing an eye-watering sting.
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