Stress, burnout and your blood

Burnout or being overstressed is not a laboratory diagnosis. A GP or occupational health physician establishes it based on your symptoms, your story and your functioning. There is no blood value that proves or rules out burnout, not even the stress hormone cortisol.

What blood testing can do is reveal or rule out physical causes that produce symptoms resembling stress. Think of a thyroid that runs too slow or too fast, or a deficiency of vitamin D or iron. Those causes are treatable, and that is exactly why it would be a shame to miss them when every symptom is attributed to stress.

Cortisol is often called the stress hormone. It helps the body respond to exertion and tension and can be associated with prolonged strain. Yet it is a difficult value to interpret. Cortisol fluctuates strongly over the day: in the morning the value usually differs from the evening. Sleep, medication and the moment of collection also play a part.

A single measurement therefore neither proves nor rules out burnout. An unremarkable result does not exclude long-term stress, and an abnormal result does not make burnout certain. Our doctor weighs the time of collection and your situation in the written explanation, and notes when a repeat measurement or further assessment can be useful.

Several physical causes produce symptoms that closely resemble overload: tiredness, irritability, poor sleep and trouble concentrating. A slow thyroid can show as fatigue and low mood; a fast thyroid as restlessness, palpitations and agitation. TSH is the first measurement for this.

A deficiency of vitamin D or of iron can also fit persistent tiredness and low energy. These causes are treatable. Ruling them out prevents a physical problem from being mistaken for stress for months, and the other way around.

With stress symptoms, a normal result is valuable information. The most common physical causes have then become unlikely. That does not mean your symptoms are not real; it means the explanation probably lies elsewhere, in workload, recovery and circumstances.

The next step is then not another test, but recovery: taking rest, restoring the balance between exertion and relaxation, and seeking support. Your GP or occupational health physician is the right route for that. A recent, doctor-reviewed result helps that conversation: the physical side has already been examined.