By glowra Flaky, itchy scalp is one of the most common hair concerns — and one of the most misunderstood. Dandruff isn’t caused by dirty hair; it’s usually driven by an overgrowth of a yeast called Malassezia, dry skin, or sensitivity to hair products. Here’s what actually works.
What Causes Dandruff?
Dandruff has a few common triggers, and identifying yours makes treatment far more effective:
- Seborrhoeic dermatitis — an overgrowth of a naturally occurring scalp yeast, often worse in winter.
- Dry scalp — smaller, less oily flakes, often linked to weather, hot showers or harsh shampoo.
- Product build-up — styling products or infrequent washing can irritate the scalp.
- Sensitivity or contact dermatitis — a reaction to a shampoo, dye or styling product ingredient.
How to Treat Dandruff
1. Use a medicated shampoo
Look for an anti-dandruff shampoo containing zinc pyrithione, ketoconazole, selenium sulfide or salicylic acid. Leave it on the scalp for the time stated on the bottle (usually 3–5 minutes) rather than rinsing straight away — this is the step most people skip, and it’s the one that matters most.
2. Don’t over-wash or under-wash
Washing too often can dry out and irritate the scalp; washing too rarely lets oil and yeast build up. Most people do best washing every 2–3 days, alternating a medicated shampoo with a gentle, sulfate-free one.
3. Be gentle with your scalp
Scratching or scrubbing aggressively damages the skin barrier and can make flaking worse. Massage shampoo in with fingertips, not nails.
4. Manage stress and diet where you can
Stress and poor sleep are known to flare seborrhoeic dermatitis. There’s no single “anti-dandruff diet”, but a generally balanced diet supports skin health.
5. See a professional if it persists
If flaking doesn’t improve after 2–4 weeks of consistent treatment, or if your scalp is red, sore or bleeding, see a pharmacist, GP or dermatologist — persistent dandruff can sometimes be confused with psoriasis or eczema, which need different treatment.
When to See a Hairdresser vs a Doctor
A good hairdresser can recommend scalp-friendly products and check whether product build-up or over-styling is contributing — browse verified hair salons near you. For redness, soreness or flaking that won’t clear up, a doctor or dermatologist is the right call, since it may not be dandruff at all.
Frequently Asked Questions
Is dandruff caused by not washing your hair enough?
Not directly. Dandruff is more often linked to a scalp yeast overgrowth, dry skin or product sensitivity than to hygiene — though very infrequent washing can make oil and flaking worse.
How long does it take for anti-dandruff shampoo to work?
Most people see improvement within 2–4 weeks of consistent use, provided the shampoo is left on the scalp for the recommended time each wash.
Can stress cause dandruff?
Stress doesn’t cause dandruff on its own, but it’s a well-documented trigger that can flare seborrhoeic dermatitis, one of the most common causes of flaking.
