Fatigue That Worsens During The Day

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 five possibilities:
  • Hypoglycemia
  • Hypothyroidism
  • Caffeine Intoxication
  • Adrenal Fatigue
  • Low Estrogens

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:
mild menopausal arthritis
T3-T4 thyroid hormone use
missing outer third of eyebrows
severe tinnitus
meal-related bloating
high iodine consumption
acne worse during period
temple-based headaches
occasionally feeling unusually cold
probable miscarriage
history of adult allergies
sensitivity to bright light
... and more than 140 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
Hypothyroidism 94% Confirm
Hypoglycemia 17% Unlikely
Caffeine Intoxication 1% Ruled out
Low Estrogens 1% Ruled out
Adrenal Fatigue 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 have fatigue that gets worse as the day progresses (afternoon or evening tiredness)?
Possible responses:
→ Don't know
→ No
→ Sometimes / moderately
→ Often / moderately
→ Often / severely
Based on your response to this question, which may indicate either absence of evening/afternoon fatigue or fatigue that worsens during the day, The Analyst™ will consider possibilities such as:
Caffeine Intoxication
Caffeine is known to cause periods of exhaustion.