Hair Health . Symptoms guide
Stress-Related Hair Loss: Testing the Real Drivers
Acute or prolonged stress can cause a noticeable shed, usually appearing 2 to 4 months after the trigger. The stress itself is rarely the only factor; it often coincides with disrupted sleep, poor appetite, weight change or delayed menstrual cycles, each of which can independently affect iron, thyroid and hormone balance. Blood testing lets the recovery plan target the actual deficits, not just the stress label.
This patient information is being clinically reviewed by our team. The factual content draws on UK guidance (NHS, NICE, British Association of Dermatologists, British Society for Sexual Medicine where cited).
What this might be
- Telogen effluvium (the stress shed). A reactive shed triggered by sustained stress, illness or crash dieting. Usually self-limiting if the underlying drivers are addressed.
- Nutritional fallout. Stress periods often involve undereating, vegan switches, or appetite loss, depleting iron and B12.
- Stress-induced thyroid changes. Chronic stress can alter TSH and free T3 in measurable ways.
Common features that suggest this
- Sustained life stress, bereavement, or burnout in the past 6 months
- Diffuse shedding rather than patchy bald spots
- Disrupted sleep or appetite
- Mood changes or low energy
Recommended tests
Same-day appointments at our Harley Street clinic, results clinician-reviewed.
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Testing advice
No fasting. Morning slot useful if cortisol context is helpful. Adrenal-specific markers are not on the standard menu but can be added by clinician request for selected cases.
Common questions
Do you test cortisol?
Not as a standard panel. A morning cortisol can be added on clinician advice if the picture suggests it. For most stress sheds, the more useful first step is iron, thyroid and vitamin D.
Will the shed reverse on its own?
Usually, yes. Once the trigger eases and any deficits are corrected, regrowth typically returns within 6 to 12 months.