Itchy scalp: common causes and what to do

Almost everyone has an itchy scalp at some point. In most cases it is not a sign of anything serious, and itchy skin often goes away by itself after a few weeks ¹. But a scalp that keeps itching deserves a closer look, because the right fix depends on the cause.

Common causes of an itchy scalp

The NHS groups the causes of itchy skin into a few families ¹. On the scalp, the most likely are:

Dandruff and seborrhoeic dermatitis

Dandruff causes white flakes and can make the scalp dry and itchy ². When there is also redness and greasy scale, it may be seborrhoeic dermatitis. See dandruff treatment and seborrhoeic dermatitis.

Psoriasis and eczema

Long-term skin conditions such as psoriasis and eczema can cause itching ¹. Scalp psoriasis typically shows as red, flaky, crusty patches covered with silvery scales ². See scalp psoriasis.

Reactions to products or heat

Allergies, hives and heat rash (prickly heat) can all cause itching ¹. On the scalp, contact dermatitis, a reaction to products such as hair dye, sprays or gels, can cause flaking and itch ². If the itch started after a new dye or styling product, that product is a suspect. See hair dye and hair loss.

Fungal infections

Ringworm is a fungal infection that can cause itching ¹. On the scalp, it can cause a red or silver rash and sometimes patchy hair loss ². It is more common in children. See scalp ringworm.

Head lice

Head lice are a classic cause of an itchy scalp, especially in children ¹. The itch is caused by an allergic reaction to the bites, and some people feel a tickling sensation in the hair ³. See head lice.

Dry skin

Sometimes itching is simply caused by dry, cracked or irritated skin ¹. See dry scalp vs dandruff.

Less common causes

Less commonly, itchy skin can be a sign of a more serious condition, such as thyroid, liver or kidney problems ¹. This is more likely when itching affects the whole body, not just the scalp.

How to ease the itch at home

The NHS suggests simple measures for itchy skin that also apply to the scalp ¹:

• Pat or tap instead of scratching
• Hold something cool on the area, such as a damp towel
• Use cool or lukewarm water, not hot, and avoid long showers
• Keep nails clean, short and smooth so scratching does less damage
• Avoid perfumed soaps and products

For the scalp in particular:

• If you have flakes, try an anti-dandruff shampoo with an active ingredient such as ketoconazole, zinc pyrithione, selenium sulfide, salicylic acid or coal tar ⁴
• If a new product preceded the itch, stop using it
• Rinse out shampoo and conditioner well

A pharmacist can tell you what products may help. For example, antihistamines may help with some causes of itching, and menthol creams or lotions can help by cooling the skin ¹. Tell the pharmacist where you are itchy and about any other symptoms.

Why scratching is a problem

Scratching gives brief relief but can damage the skin. With head lice, scratching can cause sores, and these can sometimes become infected with bacteria ³. Constant rubbing and scratching can also break hairs, which may look like thinning. See hair breakage vs hair loss.

Check for lice first in children

If a child has an itchy scalp, check for lice. The only way to be sure is to find a live louse, using a fine-toothed detection comb ⁵. Lice and nits are most often found at the neckline and behind the ears ³. Lice are not caused by dirty hair ⁵.

When to see a doctor

See a doctor if your itchy skin ¹:

• Is affecting your daily life
• Does not get better with self-care or keeps coming back
• Comes with a new rash, lump or swelling you are worried about
• Is all over your body
• Is severe
• Happens during pregnancy

Also see a doctor if your scalp is red, swollen or very itchy, or if anti-dandruff shampoo has not helped after 4 weeks ². Hair loss with an itchy, scaly patch, especially in a child, should be checked for ringworm.

A doctor will look at your scalp and ask about your symptoms. They might arrange a blood test to help find the cause, prescribe creams, lotions or tablets, or refer you to a dermatologist ¹.

Do not try to diagnose yourself

Many scalp conditions look alike. The NHS advises against self-diagnosis and suggests seeing a doctor if you are worried ¹.

The bottom line

An itchy scalp is usually caused by dandruff, dry or irritated skin, a product reaction, lice or a skin condition. Pat instead of scratching, keep water lukewarm, avoid perfumed products and try an anti-dandruff shampoo if you have flakes. If the itch persists, is severe or comes with rash, swelling or hair loss, see a doctor.

Frequently asked questions

Is an itchy scalp a sign of hair loss?

Not usually. Itching is often due to dandruff, dry skin or a product reaction, but some causes such as scalp ringworm can cause patchy hair loss ².

What can I buy for an itchy scalp?

A pharmacist can advise. Anti-dandruff shampoos help flaky itch, and antihistamines or menthol products may help some types of itching ^{1 4}.

Can stress make my scalp itchy?

Stress can make dandruff worse ², which can increase itching.

When is an itchy scalp serious?

See a doctor if it is severe, keeps coming back, affects daily life, comes with a rash or swelling, or happens in pregnancy ¹.

Educational content. Not medical advice.