The Hidden Causes of Fatigue — It’s Not Just “Being Busy”
- Tim Hayden
- Dec 19
- 1 min read
Feeling exhausted? Discover the most common medical causes of fatigue and how a simple blood test can give you clarity and a path forward.

The Hidden Causes of Fatigue, It’s Not Just “Being Busy”
If you’re waking up tired, hitting a mid-afternoon wall or relying on caffeine just to feel functional, there is always a reason. Fatigue is one of the most common symptoms we see and it’s rarely “just life.”
Your body might be trying to tell you something.
What Might Be Behind Your Fatigue?
These are the top contributors we find in midlife clients:
Low B12 or iron affects oxygen delivery and energy
Underactive thyroid, slows metabolism
Blood sugar instability, causes crashes
Chronic inflammation, drains energy
Perimenopause/menopause, impacts sleep and mood
Vitamin D deficiency, surprisingly common in the UK
You do not need to “push through it.” Fatigue is a solvable problem.
What Helps Improve Energy Immediately
Eat 20–30g protein at breakfast
Drink water before caffeine
Get daylight within 30 minutes of waking
Prioritise 7–8 hours of sleep
Reduce alcohol and late-night sugar
Still tired? That’s when testing makes all the difference.
Feeling constantly exhausted? Book a Bristol Health Hub Fatigue Blood Panel and finally understand what your body needs.




