What should I do if I constantly feel like scratching my head?

The treatment for persistent urge to scratch the head should be determined according to its underlying cause. Common clinical causes include physiological factors as well as pathological conditions such as seborrheic dermatitis and tinea capitis. Specific analyses are as follows:
　　I. Physiological Causes
Inadequate scalp hygiene or dry scalp may lead to localized itching and a resulting urge to scratch the head. In such cases, symptoms can be relieved by improving scalp cleanliness and switching to a more suitable shampoo.
　　II. Pathological Causes
　　1. Seborrheic Dermatitis
Impaired skin barrier function or low immunity may contribute to seborrheic dermatitis. When this condition affects the scalp, it can cause increased dandruff and itching. Severe itching may lead to a constant desire to scratch. Treatment may include medicated products such as compound ketoconazole shampoo, hydrocortisone butyrate cream, or triamcinolone acetonide/econazole cream, used under medical guidance.
　　2. Tinea Capitis (Scalp Fungal Infection)
Tinea capitis may cause varying degrees of itching and pain, leading to an urge to scratch the head, and is often accompanied by a distinctive odor in the affected area. Treatment options include miconazole nitrate cream, compound ketoconazole cream, or compound povidone-iodine lotion, used as directed by a physician.
　　Additionally, other conditions such as calcium deficiency, contact dermatitis, and prickly heat (miliaria) may also cause similar symptoms and require timely medical evaluation. It is advisable to use mild, non-irritating shampoos and avoid or limit consumption of foods that induce sweating, oily or greasy foods, raw or cold foods, and spicy or irritating foods.