Saliva Quantity

What Causes Dry Mouth Or Excess Saliva?

Dry mouth or excess saliva can have various causes, ranging in severity from 'minor' to 'generally fatal'.  Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.

Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms.  In order to diagnose dry mouth or excess saliva, we could:
  • Research the topic
  • Find a doctor with the time
  • Use a diagnostic computer system.
The process is the same, whichever method is used.

Step 1: List all Possible Causes

We begin by identifying the disease conditions which have "dry mouth or excess saliva" as a symptom.  Here are eight of many possibilities (more below):
  • Dehydration
  • High Histamine
  • Rheumatoid Arthritis
  • Chemotherapy Side-Effects
  • Drug Side-Effects
  • Parkinson's Disease
  • Chronic Fatigue-Fibromyalgia
  • Iron Deficiency Anemia

Step 2: Build a Symptom Checklist

We then identify all possible symptoms and risk factors of each possible cause, and check the ones that apply:
frequent morning stiffness
possible Parkinson's disease
occasional unexplained nausea
microcytic red cells
long term neck stiffness
highly elevated lymphocyte count
slightly tight muscles
confirmed Parkinson's disease
being a lethargic person
excessive thirst
minor joint pain/swelling/stiffness
frequent 'chills'
... and more than 130 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of dry mouth or excess saliva:
Cause Probability Status
High Histamine 95% Confirm
Chronic Fatigue-Fibromyalgia 20% Unlikely
Drug Side-Effects 27% Unlikely
Dehydration 0% Ruled out
Iron Deficiency Anemia 0% Ruled out
Rheumatoid Arthritis 0% Ruled out
Parkinson's Disease 0% Ruled out
Chemotherapy Side-Effects 0% Ruled out
* This is a simple example to illustrate the process

Arriving at a Correct Diagnosis

The Analyst™ is our online diagnosis tool that learns all about you through a straightforward process of multi-level questioning, providing diagnosis at the end.

In the Mouth/Oral Symptoms section of the questionnaire, The Analyst™ will ask the following question about saliva quantity:
In general, how plentiful is the saliva in your mouth?
Possible responses:
→ My mouth is often very dry
→ My mouth is sometimes a bit dry
→ Normal / don't know
→ I always have plenty of saliva
→ Excess saliva, with a tendency to drool
Based on your response to this question, which may indicate very dry mouth, dry mouth, abundant saliva in mouth or excess saliva in mouth, The Analyst™ will consider possibilities such as:
Chemotherapy Side-Effects
Radiation can damage the salivary glands and reduce the amount of saliva produced.
Cigarette Smoke Damage
Smoking or chewing tobacco can reduce saliva production.
... and also rule out issues such as:

Related Questions

Mouth/Oral Symptoms