A Natural Part of the Fight and Flight System

Anxiety is a natural response, and in small doses it's actually healthy. Some of the symptoms of anxiety - including nausea - are designed to tell your brain that there is something dangerous or new, so that you make a smart decision with your next action. Your brain releases the neurotransmitter serotonin, and your stomach has receptors for serotonin that cause your stomach to know that you're facing a distressing situation.

The problem only occurs when you are suffering from regular stress and anxiety. Then your anxiety nausea can disrupt your ability to perform at school, work, and in your personal life