Here’s a cruel joke: Being dehydrated can make you throw up water. When you’re depleted, your stomach lining gets irritated, and any liquid that hits it gets rejected as “too much, too fast.” It’s like showing up to a party starving, but the host hands you a gallon of milk—your stomach burns the invitation. Surprising fact: Even the smell of water can trigger nausea in people with hyperosmia (super-sensitive smell). Yes, your nose can betray you too.
Nausea And Vomiting After Drinking Throwing Up After Drinking: Causes,