Hair Health . Symptoms guide
Sudden Patchy Hair Loss (Possible Alopecia Areata)
Sudden, coin-shaped bald patches appearing within days or weeks are characteristic of alopecia areata, an autoimmune condition where the immune system attacks follicles. Alopecia areata is associated with other autoimmune conditions (especially thyroid), so a panel covering thyroid antibodies and broader inflammatory markers is worthwhile alongside referral for dermatological review.
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
- Alopecia areata. Autoimmune. Usually treatable; spontaneous regrowth is common.
- Associated thyroid autoimmunity. Hashimoto and Graves disease cluster with alopecia areata.
- Tinea capitis (scalp ringworm). Less common in adults but possible. Requires a different treatment path.
When to seek urgent advice
If any of the following apply, please contact your GP, NHS 111, or A&E in the first instance rather than waiting for private bloodwork.
- Rapid spread beyond the original patch
- Loss involving eyebrows, eyelashes or beard
- Total scalp or body hair loss
Common features that suggest this
- Smooth, coin-shaped patch of hair loss
- Tingling or itching before the patch appeared
- No visible scarring
- Family history of autoimmune conditions
Recommended tests
Same-day appointments at our Harley Street clinic, results clinician-reviewed.
Need a marker not in these panels? Build a custom panel and a GMC-registered clinician will design one for you.
Testing advice
No fasting. A dermatology referral is often appropriate; our panels complement that by checking for associated thyroid and nutritional contributors.
Common questions
Will my hair grow back?
In most early cases, yes, often within 6 to 12 months. Recurrent or extensive disease has a more variable course and benefits from specialist input.
Should I be tested for thyroid antibodies?
Thyroid antibodies are not in the standard panels but can be added by clinician request when alopecia areata is suspected.
Related symptoms
Sources and further reading
This page provides general information only and is not a substitute for medical advice. A GMC-registered clinician will review your results and tailor any recommendations to you personally.