Definition
Nausea is a sensation of unease in the stomach, often with the urge to vomit. In the context of anxiety it's one of the most common physical features, especially before public speaking, exams, difficult conversations, or other anticipated stressors.
What it can feel like
A churning, hollow, or fluttering feeling in the upper stomach. Loss of appetite. Sometimes an urgent need to use the bathroom. Occasionally vomiting in the lead-up to a high-stakes event. The sensation usually eases once the event begins or once the activation comes down.
Why it happens
The autonomic nervous system tightly couples gut function to threat states. Sympathetic activation slows digestion, redirects blood away from the stomach, and increases gut motility lower in the tract. The vagus nerve also carries signals between the gut and the brain in both directions, which is part of why anxiety is so reliably felt in the stomach. Persistent or severe nausea without an obvious anxiety driver deserves a medical evaluation. Anxiety-related nausea typically resolves with treatment of the underlying pattern.
When to see a clinician
Nausea that comes only in identifiable anxious moments and resolves with the situation is usually anxiety-related. Persistent nausea, weight loss, vomiting, or nausea that doesn't track with stress deserves a medical evaluation first.