The following are just some of the conditions and situations that can result in an itchy scalp:3, 4
A reaction to a haircare product. How thoroughly do you rinse your hair in the shower? Leaving some shampoo on your scalp can irritate it, so if your scalp is dry and flaky as well as itchy, and you take super speedy showers, you might need to slow down a little and make sure you rinse your shampoo out completely. If you have an itchy rash on your scalp, that could indicate an allergy to a haircare product (or to one of its ingredients).
Dandruff. If you spot little flakes of skin on your scalp, in your hair, and/or on your clothes, and your scalp is dry and itchy, you might have dandruff. Learn more about dandruff and hair loss here.
Head lice. An itchy scalp is the most common symptom of head lice. It’s actually the bites of the lice that cause the itching, and the bites may also result in red, irritated scalp skin.5
Plaque psoriasis. This is the most common type of psoriasis,6 and approximately 50% of sufferers will experience a flare-up on the scalp. This can manifest as reddish patches on the scalp, flaking similar to dandruff, silvery-white scale, and a dry, mildly to intensely itchy scalp.
Atopic dermatitis. Atopic dermatitis is a type of eczema which can develop on the scalp. Along with an itchy scalp, symptoms can include scalp redness and scale, and the sensation of the scalp burning.