Decreased Ability To Taste

What Causes Reduced Sense Of Taste?

Reduced sense of taste can have various causes, ranging in severity from 'worrying' to 'generally fatal'.  Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.

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  • check your overall health status
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  • identify any nutritional deficiencies

Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms.  In order to diagnose reduced sense of taste, 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 "reduced sense of taste" as a symptom.  Here are eight of many possibilities (more below):
  • Lyme Disease
  • Alzheimer's Disease
  • Zinc Need
  • Lichen Planus
  • Bell's Palsy
  • Brain Tumor
  • Vitamin B12 Need
  • Depression

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:
continuing significant limb numbness
vegetarian diet
discontinued prednisone use
high alcohol consumption
low aerobic exercise level
moderate unexplained weight loss
history of brain cancer
reduced mental clarity
B12 deficiency
frequent hangnails
having trouble concentrating
attempting suicide
... and more than 100 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of reduced sense of taste:
Cause Probability Status
Lyme Disease 99% Confirm
Bell's Palsy 27% Unlikely
Alzheimer's Disease 20% Unlikely
Zinc Need 2% Ruled out
Vitamin B12 Need 2% Ruled out
Depression 2% Ruled out
Lichen Planus 1% Ruled out
Brain Tumor 1% 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 decreased ability to taste:
Has your sense of taste declined within the past few years, for reasons other than nasal congestion?
Possible responses:
→ Don't know
→ No, my sense of taste has remained about the same
→ Yes, but it is due to ongoing nasal congestion
→ Yes, it is somewhat worse now
→ Yes, it is a lot worse now
Based on your response to this question, which may indicate no change in sense of taste, loss of taste due to blocked nose, reduced sense of taste or much reduced sense of taste, The Analyst™ will consider possibilities such as:
Alzheimer's Disease

Alzheimer's disease may lead to a decreased sense of taste.

Bell's Palsy

The facial nerve also innervates some of the taste buds of the tongue, sometimes causing a reduction in the sense of taste.


Depression is associated with reduced levels of serotonin and noradrenalin.  The decrease of these levels has been linked to the loss of sense of taste.

Guillain-Barre Syndrome

The sense of taste may become altered or reduced.

Oral Lichen Planus

If the tongue is affected, this may result in a blunted taste sensation.

Vitamin A Requirement

Taste deficiency is reported by patients with vitamin A deficiency; vitamin A helps maintain a keen sense of taste and smell.

Concerned or curious about your health?  Try The Analyst™
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