An itchy scalp is one of the most common hair complaints. Most of the time the cause is minor and easy to manage, such as dandruff or a product that does not suit you. Sometimes itching is a sign of a skin condition that needs treatment. Looking at what else is happening on your scalp usually points to the cause.
Common causes at a glance
| Cause | Typical clues |
|---|---|
| Dandruff or seborrhoeic dermatitis | Oily flakes, sometimes redness; may affect eyebrows and ears |
| Dry scalp | Fine dry flakes, tightness, worse in winter |
| Reaction to a hair product | Itching, redness or a rash after a new shampoo, dye or styling product |
| Product build-up or sweat | Itching that improves after a thorough wash |
| Head lice | Intense itching, especially behind the ears and at the nape; tiny eggs stuck to hairs |
| Scalp psoriasis | Thick, silvery scales on red, well-defined patches |
| Fungal infection (scalp ringworm) | Scaly patches with broken hairs or hair loss, mostly in children |
| Tight hairstyles | Soreness and itching along the hairline or under braids |
Dandruff
Dandruff is the most frequent reason for an itchy, flaky scalp. An anti-dandruff shampoo used regularly for a few weeks usually controls it. Dandruff vs Dry Scalp: How to Tell the Difference explains how it differs from a dry scalp.
Dry scalp
Cold weather, hot water and frequent washing with strong shampoos dry the scalp. Wash a little less often, switch to a gentle shampoo and keep the water lukewarm.
Reactions to hair products
Itching that begins after a new product suggests irritation or allergy. Hair dye is a well-known cause, especially dyes containing paraphenylenediamine (PPD). A reaction can appear within hours or a day or two, with itching, redness and sometimes swelling of the scalp, face or eyelids.
- Stop using the product and rinse the scalp well.
- Seek urgent medical help for swelling of the face, eyes or lips, or difficulty breathing.
- Follow the patch test instructions before every dye. See Hair Dye Patch Test: How to Follow Product Instructions.
Fragrance and some preservatives in shampoos can also cause reactions. Sensitive Scalp Care: Tips for a Gentle Routine covers care for a sensitive scalp.
Build-up, sweat and infrequent washing
Residue from styling products, oil and sweat can irritate the scalp. A clarifying wash often brings relief. See Scalp Buildup: Causes and Cleansing Tips.
Head lice
Lice are common in children and spread through head-to-head contact. They are treated with special lotions or by combing wet hair with a fine-toothed detection comb. A pharmacist can advise. Lice have nothing to do with how clean someone's hair is.
Skin conditions
Psoriasis, eczema and other skin conditions can affect the scalp. They often need medicated shampoos or prescription scalp treatments, so a diagnosis is the first step.
Gentle care while you find the cause
- Do not scratch with your nails. Scratching damages the skin and can lead to infection. Press or tap the area instead.
- Wash with lukewarm water and a mild shampoo.
- Rinse out all shampoo and conditioner.
- Stop any product you started recently.
- Avoid tight styles, hot tools on the scalp and heavy oils until the itch settles.
- Keep brushes, hats and pillowcases clean.
When to see a doctor
See a doctor or dermatologist if:
- Itching lasts more than a few weeks or keeps you awake.
- You have sores, crusts, oozing, pain or swelling.
- You notice patches of hair loss.
- The itch began after a hair dye and you have swelling or a rash.
- A child has scaly patches or broken hairs.
- Your whole body itches, not just your scalp.
Persistent Scalp Flaking: When to See a Dermatologist explains what happens at a dermatology visit for scalp problems.
Related on ArniSun
- Dandruff vs Dry Scalp: How to Tell the Difference
- Sensitive Scalp Care: Tips for a Gentle Routine
- Persistent Scalp Flaking: When to See a Dermatologist
- Hair Dye Patch Test: How to Follow Product Instructions
- Scalp Buildup: Causes and Cleansing Tips
Sources and further reading
Frequently asked questions
Why does my scalp itch but I have no dandruff?
Possible reasons include a dry scalp, a reaction to a product, sweat or build-up, a sensitive scalp or the early stage of a skin condition. If it lasts, ask a doctor.
Can stress make my scalp itch?
Stress can worsen conditions such as dandruff, psoriasis and eczema, and it can make itching feel more intense.
Does an itchy scalp cause hair loss?
Itching does not cause hair loss directly, but hard scratching can break hairs, and some conditions that itch can also cause shedding. Treating the cause protects your hair.