Is it worth getting your hormones tested when you feel run-down?
Hormone testing for low energy is clearly useful in certain situations, particularly after giving birth or when you already have a thyroid condition. For most people with fatigue or burnout, cortisol measurements and standard thyroid tests add little value.
Thyroid testing for fatigue is most useful in one specific situation: in people who have recently given birth. Postpartum thyroid inflammation affects 5 to 10 percent of women after delivery and unfolds in two stages: first too much thyroid hormone (anxiety, heart palpitations), then too little (fatigue, low mood, weight gain). Because these symptoms closely resemble ordinary postpartum complaints, the condition is often missed. If tiredness persists in the first year after giving birth, a thyroid test is therefore worthwhile.
For anyone who already has a thyroid problem, testing makes sense, but treatment helps less than many people expect. In older adults with a slightly elevated TSH and otherwise normal thyroid hormone levels, treatment with thyroid medication does not demonstrably improve fatigue, mood, or quality of life. And for people with an underactive thyroid who are already on standard treatment, adding a second thyroid hormone brings little benefit: many studies found no improvement in fatigue, pain, weight, or thinking ability.
Testing cortisol levels for ordinary low energy or chronic tiredness is of little value as a diagnostic tool for the individual person. In people with chronic fatigue syndrome, cortisol levels are on average slightly lower than in healthy people, but the difference is too small and too variable to be used as a reliable test. For burnout and fibromyalgia, the findings are even less consistent.
The diagnosis of 'adrenal fatigue', which is sometimes made on the basis of cortisol measurements, is a different matter entirely: not a single recognised professional body of hormone specialists accepts it as a genuine medical diagnosis. A thorough analysis of 58 studies found no reliable evidence that this syndrome exists. Cortisol measurements in tired people produced contradictory and non-reproducible results. Do not be persuaded to pay for an expensive cortisol test outside a medical setting, as the result tells you almost nothing about the cause of your fatigue.
This answer draws on several large analyses combining dozens of studies, in particular on thyroid hormones and cortisol in relation to fatigue. The cortisol findings are largely based on people followed over time without any treatment being assigned, so cause and effect cannot be firmly established there. The thyroid treatment findings come from studies where treatments were compared directly, which makes those conclusions more robust. The evidence on postpartum thyroid inflammation is moderate in volume but points clearly in one direction. The researchers behind the cortisol studies themselves emphasise that group averages cannot be used to make a diagnosis for an individual person.
Does excess weight really make your hormones worse?
Excess weight disrupts hormone function in several well-documented ways, and losing weight largely reverses this. That makes a healthy weight one of the most concrete levers for better hormonal balance.
Can eating too little disrupt your hormones?
Even a temporary, substantial calorie deficit can disrupt sleep and reproductive hormones in healthy women; the timing of your meals also plays an independent role. If you are structurally eating little and experiencing hormonal complaints, that is a good reason to reconsider your eating pattern and potentially discuss it with a doctor.
What are normal hormone levels for women, and how do you get them tested?
There is no universal standard for hormone levels in women: they depend on age, cycle phase, and measurement method. Always have testing guided by a doctor who takes that context into account, especially for testosterone.
What role do hormones play in mental health complaints?
Hormones, and cortisol in particular, play a demonstrable role in mental health complaints in a proportion of patients, but psychiatry cannot simply use this as a universal explanation. Have your hormone levels measured if you suspect that stress or hormonal dysregulation is contributing to your complaints, and discuss this specifically with your doctor.
How do you get your hormone levels tested during perimenopause?
Hormone tests during perimenopause are difficult to interpret: AMH is the most practical option, but does not reliably predict your fertility. Always have results interpreted with the guidance of a doctor.
How do I know whether my mood swings are hormonal or something else?
The cyclical pattern of your symptoms is the best distinguishing factor: if they occur only in the two weeks before your period and disappear afterwards, a hormonal cause is most likely. Track your symptoms over several cycles, and if they persist outside that window, discuss this with your GP.