Afternoon Or Evening Tiredness

What Causes Afternoon Or Evening Fatigue?

Afternoon or evening fatigue can have various causes, ranging in severity from 'minor' to 'very serious'.  Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.

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Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms.  In order to diagnose afternoon or evening fatigue, 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 "afternoon or evening fatigue" as a symptom.  Here are eight possibilities:
  • Hypothyroidism
  • Caffeine Intoxication
  • Low Estrogens
  • Syndrome X
  • Stress
  • Hypoglycemia
  • Adrenal Fatigue
  • Narcolepsy

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:
regular sleepwalking
inability to work under pressure
severe flatulence
hypoglycemia
poor bodily coordination
unsound sleep
occasional confusion/disorientation
severe allergies to certain foods
having hot flashes
frequent postprandial somnolence
history of adolescent acne
arrhythmia
... and more than 180 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of afternoon or evening fatigue:
Cause Probability Status
Narcolepsy 90% Confirm
Adrenal Fatigue 30% Unlikely
Caffeine Intoxication 12% Unlikely
Low Estrogens 5% Ruled out
Syndrome X 1% Ruled out
Hypothyroidism 1% Ruled out
Stress 1% Ruled out
Hypoglycemia 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.

If you indicate being fatigued, The Analyst™ will ask further questions including this one:
Do you regularly become tired in the afternoon or evening and feel like having a nap? Do not answer if the reason is lack of sleep or you work at night.
Possible responses:
→ I don't sleep enough / I work nights / don't know
→ No / my energy level is generally fine
→ I feel like napping several times a month
→ I need a nap most days / fall asleep occasionally
→ I regularly fall asleep involuntarily
Based on your response to this question, which may indicate absence of afternoon/evening fatigue, slight afternoon/evening fatigue, moderate afternoon/evening fatigue or severe afternoon/evening fatigue, The Analyst™ will consider possibilities such as:
Caffeine Intoxication

Caffeine is known to cause periods of exhaustion.

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