In a nutshell
During nausea, the mouth sometimes suddenly becomes very watery. Increased saliva flow is one possible accompanying autonomic response and does not necessarily mean that vomiting will follow.
Why does it happen?
Signals from the digestive tract, vestibular system, or higher brain centers can activate nausea networks. Autonomic outputs then increase salivary-gland secretion, among other responses. Pallor, sweating, or changes in heart rate can occur at the same time.
Frequency
Increased salivation can accompany nausea but is not noticed equally clearly by everyone affected. No reliable general prevalence is given here for this accompanying symptom.
Frequency is a qualitative description, not your individual probability.
Is it normal?
A temporary increase in saliva can accompany nausea; recurrent nausea should be assessed.
When to seek advice
Persistent vomiting, inability to keep down fluids, blood, severe abdominal pain, or nausea with chest pain requires prompt medical help.
Does this happen to you?
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Sources (1)
- Übelkeit und Erbrechen – Clinical Methods (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
