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.

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
  • Narcolepsy
  • Stress
  • Adrenal Fatigue
  • Syndrome X
  • Low Estrogens
  • Hypoglycemia

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:
recurring depression
suspected adrenal insufficiency
absent sexual desire
history of adult allergies
low diastolic blood pressure
eating during sleep hours
poor bodily coordination
depression with fatigue
frequent postprandial somnolence
rapid pulse rate
... and more than 170 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
Hypoglycemia 90% Confirm
Caffeine Intoxication 12% Unlikely
Low Estrogens 30% Unlikely
Narcolepsy 5% Ruled out
Stress 1% Ruled out
Hypothyroidism 1% Ruled out
Adrenal Fatigue 1% Ruled out
Syndrome X 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? 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.