Thyroid

Both an underactive and an overactive thyroid can cause diffuse thinning. A thyroid function test checks both.

Anaemia and iron

A full blood count shows anaemia, which can be linked to shedding. Iron stores (ferritin) aren’t part of an FBC, so ask us if you’d like them checked; ferritin is included in our Postnatal blood test.

Hormones in women

Thinning at the crown with acne, extra facial hair or irregular periods can be a sign of raised androgens, often from PCOS. The Free Androgen Index or PCOS Profile can help.

After having a baby

Heavy shedding two to four months after birth is very common and usually settles by itself. If it doesn’t, the Postnatal blood test checks iron, thyroid and key vitamins.

Vitamin D

Low vitamin D has been linked with some types of hair loss and is very common in the UK, so it’s worth checking.

When to see a doctor

Patchy hair loss, a red, sore or scaly scalp, or sudden loss of large amounts of hair should be checked by your GP.

Please note: this guide is general information and doesn’t replace advice from your GP. If you feel very unwell, call NHS 111, or 999 in an emergency.

Tests mentioned in this guide

General healthPopular