tchy scalp can quickly become a source of significant daily discomfort. This phenomenon can be caused by many different factors. To better soothe it, it's therefore important to understand its origin. Here are the main causes.
Is your scalp itchy? This unpleasant sensation can occur at any time of day, distracting you from your tasks and even disrupting your daily routine. But know that this is a very common phenomenon that can be caused by many factors.
Skin diseases: why is my scalp itchy?
Seborrheic dermatitis
In an interview with Shape magazine , American dermatologist Dr. Anna Chacon identified several factors that can cause an itchy scalp. She first mentioned one of the most common causes of scalp itchiness: seborrheic dermatitis , an inflammatory skin condition characterized by the appearance of red patches covered with scales and dandruff. This condition is caused by the production of sebum, which promotes the abnormal proliferation of yeasts naturally present on the skin and scalp. This results in an inflammatory reaction, redness, and an accelerated turnover of scalp and skin cells.
Psoriasis
Other factors are less common but also cause scalp itching, including psoriasis . This is an autoimmune disease that causes red patches and scales.
Contact dermatitis
Dr. Chacon also mentions contact dermatitis , an allergic reaction or irritation linked to hair products, particularly hair dye or shampoo. “Read product labels and know what to look for,” advises Dr. Anna Chacon. She specifically points to sulfates, parabens, alcohol, perfumes, and synthetic dyes—substances that can cause itching, especially if you already have sensitive skin or a scalp condition.
“If you notice any of the ingredients listed above, especially those listed first on the label (indicating a higher concentration), you should perhaps consider alternative products. For those with sensitive skin or those prone to scalp irritation, opt for products labeled as hypoallergenic, for sensitive skin, or all-natural,” recommends the specialist, who advises doing a patch test before using a hair product for the first time : spread the product on the inside of your forearm and leave it for a full day. If you experience irritation or itching in this area, do not use the product.
Lice, eczema, hives: other conditions that can cause itching
To complete the list of skin conditions that can cause an itchy scalp, an article published in Harvard Health Publishing, the website of Harvard Medical School, also mentions atopic dermatitis, a form of eczema that can also affect the scalp. Fungal infections, lice, and hives (urticaria), which can occur as a reaction to food, medication, or sweat, should also not be overlooked. If your itching is due to this type of condition, you will need a doctor's prescription to receive effective treatment.
Itchy scalp: pollution and stress are to blame
Finally, certain environmental factors can cause an itchy scalp, such as pollution , dry weather, and stress , which can "aggravate physical discomfort ." Don't hesitate to consult a dermatologist, who can first make a diagnosis and then prescribe shampoos tailored to the problem to soothe your scalp. " If your itchy scalp persists for more than a week, is severe, or is accompanied by symptoms such as hair loss, sores, or a rash, it's time to consult a professional," advises Dr. Anna Chacon.
Sources:
“ How to Save Yourself From an Itchy Scalp, According to a Dermatologist ”, Shape
“ What could be causing your itchy scalp? ”, Harvard Health Publishing, Harvard Medical School
Scalp: the right steps to take to care for it daily
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