A sudden rush of saliva, sometimes called water brash, is a lesser-known reflux symptom that surprises a lot of people the first time it happens. It's the mouth's automatic response to acid reaching the esophagus — saliva is mildly alkaline, and producing more of it is the body's built-in way of trying to neutralize and wash the acid back down.
Why it happens specifically with reflux
The esophagus has nerve endings that, when irritated by acid, signal the salivary glands to ramp up production. It often happens right alongside or just before a burning sensation, functioning as an early warning sign for some people before the more classic heartburn symptom is even noticeable.
What to do when it happens
Swallowing normally, rather than spitting, actually supports the body's own defense mechanism, since swallowed saliva helps clear acid from the esophagus. If water brash happens frequently, especially alongside other reflux symptoms, it's worth treating as another data point that reflux is active and adjusting meals, timing, or discussing medication with a doctor accordingly, rather than an isolated, unrelated symptom.
