Itchy scalp with dandruff may generally be caused by hygiene habits, seborrheic dermatitis, scalp furuncle, tinea capitis, psoriasis and so on. 1. Hygiene habits: If you don’t pay attention to cleanliness and hygiene, the scalp accumulates more dirt, which may stimulate the scalp, leading to increased dandruff, accompanied by itching. 2. Seborrheic dermatitis: Seborrheic dermatitis is a chronic inflammatory skin disease, which usually leads to excessive oil secretion of the scalp causing bacterial infections, resulting in increased dandruff and itching of the affected area. 3. Scalp chaffing: scalp chaffing, also known as dry seborrhea, some patients will be examined chaffing spore bacteria, bacterial infection leads to increased dandruff, scalp itching. 4. Tinea capitis: when fungal infection occurs in the skin of the head, the symptoms of itchy scalp with dandruff will also appear. 5. Psoriasis: Psoriasis on the head may produce a large number of inflammatory plaques and flaking reaction on the scalp, thus causing itchy scalp with dandruff. It is recommended that patients go to the hospital in time for examination, clear diagnosis, symptomatic treatment, and pay attention to personal hygiene habits in daily life.