What else can cause head itching besides lice? - briefly
Scalp itching may stem from dandruff, seborrheic dermatitis, allergic reactions, psoriasis, fungal infections, or dry skin. Irritating hair products, harsh chemicals, or tight hairstyles can also provoke the symptom.
What else can cause head itching besides lice? - in detail
Scalp itching can arise from many conditions unrelated to parasites.
- Seborrheic dermatitis – excess oil and Malassezia yeast provoke inflammation, producing flaky, itchy patches.
- Psoriasis – hyperproliferation of keratinocytes creates silvery scales and persistent pruritus.
- Atopic or contact dermatitis – allergens in shampoos, dyes, or hair‑care products trigger immune‑mediated irritation.
- Fungal infection (tinea capitis) – dermatophytes invade hair shafts, causing localized soreness, scaling, and itching.
- Folliculitis – bacterial colonization of hair follicles leads to pustules and a burning itch.
- Dry scalp – insufficient moisture disrupts the barrier function, resulting in tight, itchy skin.
- Dandruff – flaking from mild seborrheic dermatitis or irritation by harsh detergents produces itch.
- Allergic reactions – sensitivity to preservatives, fragrances, or latex in hats and headgear can cause acute itching.
- Chemical or heat damage – repeated bleaching, perming, or excessive heat styling weakens the cuticle, inducing irritation.
- Tight hairstyles – traction from braids, ponytails, or extensions creates mechanical stress and pruritus along the hairline.
- Sunburn – UV exposure damages the scalp skin, leading to painful itching during healing.
- Systemic illnesses – liver disease, iron‑deficiency anemia, or thyroid dysfunction may manifest as generalized scalp itch.
- Medication side effects – antihypertensives, opioids, and certain antibiotics list pruritus as a common adverse effect.
- Neuropathic causes – nerve irritation or neuropathy can produce abnormal sensations, including scalp itching.
Accurate diagnosis requires clinical examination, possible skin scraping, patch testing, or laboratory studies. Targeted treatment—antifungal agents, corticosteroid creams, moisturizers, or medication adjustments—addresses the underlying mechanism and relieves the symptom.