Health guide
Why am I always tired? The tests worth checking
Feeling tired all the time, even after a full night's sleep, is one of the most common reasons people get a blood test, and for good reason. A handful of inexpensive tests uncover most physical causes of fatigue, from a slow thyroid to a vitamin or iron deficiency. Testing turns a vague, frustrating symptom into something specific you and your doctor can act on.
Reviewed by Dr. Vishal Singh, Lab Director
Signs your fatigue is worth testing
- Tiredness that rest and sleep do not fix
- Low energy on most days
- Poor concentration or brain fog
- Breathlessness or palpitations
- Hair fall or pale skin
- Feeling cold, or a low mood
The usual testable causes
The common, treatable culprits behind constant tiredness are an underactive thyroid (TSH), vitamin B12 deficiency, iron deficiency (iron studies with a CBC), vitamin D deficiency, and high or unstable blood sugar (HbA1c). Anaemia ties several of these together. A full body checkup screens for all of them in a single home visit.
Where to start
If you are not sure which applies, a full body checkup is the efficient first step because it covers every common cause at once. If your symptoms point one way (feeling cold and gaining weight suggests the thyroid; pale skin and breathlessness suggest iron), you can test that directly. The guides linked below go deeper on each.
This guide is for general information and is not a diagnosis. Always discuss your symptoms and results with a doctor. LabONE includes a free doctor consultation with every report.
Tests that help
Recommended panel
EnergyShield
7 parameters in one panel
Frequently asked questions
Which test should I do for constant tiredness?
The highest-yield checks are thyroid (TSH), vitamin B12, iron studies, vitamin D, and blood sugar (HbA1c). If you are unsure, a full body checkup covers all of them at once and is the simplest place to start.
Can a vitamin deficiency really cause fatigue?
Yes. Low vitamin B12, low iron, and low vitamin D are among the most common and most fixable causes of ongoing tiredness, which is why they are worth testing for before assuming it is just stress or poor sleep.
Not sure where to start?
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