Why Am I Always Tired? Blood Test London – Find the Real Cause
Constantly tired, even after a full night’s sleep?
You are not alone. Many people across London feel exhausted daily without knowing why.
This guide explains the real causes of fatigue, what your body may be trying to tell you, and how a simple blood test can uncover the root problem.
What Does “Always Tired” Actually Mean?
Feeling tired occasionally is normal. However, persistent fatigue is not.
If you experience:
- Low energy every day
- Difficulty concentrating
- Poor motivation
- Feeling drained after simple tasks
Your body may be signalling an underlying issue.
Fatigue is a symptom, not a condition.
The Most Common Causes of Fatigue
There is no single reason for ongoing tiredness. In most cases, it is linked to internal imbalances.
- Vitamin Deficiencies
Low levels of:
- Vitamin B12
- Vitamin D
- Iron
can significantly reduce energy levels.
These are among the most common causes of fatigue in the UK.
- Iron Deficiency and Anaemia
Iron plays a key role in oxygen transport.
Low iron can lead to:
- Weakness
- Dizziness
- Shortness of breath
This is particularly common in:
- Women
- Athletes
- Individuals with poor diet
- Thyroid Dysfunction
The thyroid controls metabolism.
An underactive thyroid can cause:
- Extreme fatigue
- Weight gain
- Brain fog
Many people remain undiagnosed for years.
- Hormonal Imbalance
Hormones regulate energy, mood, and sleep.
Imbalances in:
- Cortisol (stress hormone)
- Testosterone
- Oestrogen
can all contribute to fatigue.
- Chronic Stress and Burnout
Living in London often means:
- Long working hours
- High pressure
- Poor sleep
This can lead to adrenal fatigue-like symptoms, including constant exhaustion.
- Poor Sleep Quality
Even if you sleep 7–8 hours, poor sleep quality can leave you feeling tired.
Causes include:
- Stress
- Hormonal imbalance
- Lifestyle habits
Why You Should Not Ignore Fatigue
Many people normalise tiredness.
However, long-term fatigue may indicate:
- Early metabolic issues
- Hormonal disorders
- Chronic inflammation
- Nutrient depletion
Ignoring fatigue delays diagnosis and recovery.
When Should You Get a Blood Test?
You should consider testing if you:
- Feel tired most days
- Wake up feeling unrefreshed
- Experience brain fog
- Have low mood or motivation
- Notice reduced performance at work or gym
Early testing leads to faster recovery.
Private Blood Test London – Find the Root Cause
At Marylebone Diagnostic Centre, we focus on identifying the cause of fatigue, not just managing symptoms.
Our approach is simple:
✔ Test
✔ Identify
✔ TreatRecommended Fatigue Blood Test Profile
Comprehensive Fatigue Panel
This profile is designed to detect the most common causes of tiredness.
Includes:
Full Blood Count (FBC)
- Detects anaemia
- Assesses overall health
Iron Studies
- Ferritin
- Transferrin
- Iron levels
Vitamin Testing
- Vitamin B12
- Vitamin D
Thyroid Function
- TSH
- Free T3
- Free T4
Inflammation Markers
- CRP
These markers provide a complete overview of your internal health.
Book Your Fatigue Blood Test
Book Now
📍 73 Baker Street, London W1U 6RD
📞 +44 7495 970109Results within 24–42 hours. No GP referral required.
What Happens After Your Results?
Once your results are ready:
- You receive a clear report
- Abnormal markers are highlighted
- Next steps are explained
This may include:
- Dietary changes
- Supplementation
- Further testing
The goal is clarity, not confusion.
Can Fatigue Be Fixed?
In many cases, yes.
Once the cause is identified, improvements can be rapid.
Examples:
- B12 deficiency → energy improves within weeks
- Iron deficiency → significant recovery after correction
- Thyroid issues → manageable with treatment
The key is identifying the cause early.
Why Choose Marylebone Diagnostic Centre?
At Marylebone Diagnostic Centre, we offer:
- Results within 24 – 42 hours
- On-site consultant review
- Private and discreet service
- No GP referral needed
- Central London location
📍 5-minute walk from Baker Street tube
Related Tests You May Consider
To fully understand your health, you may also benefit from:
FAQs
This may be due to vitamin deficiencies, hormonal imbalance, or underlying health conditions that require testing.
A comprehensive panel including iron, vitamins, thyroid, and inflammation markers provides the best insight.
Most results are available within 24–42 hours at Marylebone Diagnostic Centre.
Yes. Persistent fatigue can indicate underlying conditions such as thyroid issues, anaemia, or metabolic disorders.
Written By
Dr Lauren
Consultant in Women’s Health & Fertility Specialist
Contributor to clinical education at Marylebone Diagnostic Centre
