1. Skin Conditions: Conditions like eczema, psoriasis, or seborrheic dermatitis can make the scalp more sensitive. These conditions often cause inflammation, itching, and flaking, leading to discomfort.

2. Allergic Reactions: Reactions to hair care products, such as shampoos, conditioners, dyes, or styling products, can lead to scalp sensitivity. Ingredients like sulfates, parabens, or fragrances are common culprits.

3. Dry Scalp: Lack of moisture can make the scalp dry and prone to irritation. Dryness might result from harsh weather conditions, frequent washing, or using products that strip natural oils.

4. Sunburn: Spending time in the sun without protecting your scalp can lead to sunburn, which makes the scalp tender and sensitive.

5. Stress: Stress can manifest physically, causing your scalp to become more sensitive. It’s thought that stress can disrupt the skin barrier, making it more susceptible to irritation.

6. Hair Care Habits: Over-washing, using hot water, or applying too much heat from styling tools can damage the scalp’s protective barrier, leading to sensitivity.

7. Hormonal Changes: Hormonal fluctuations, particularly during pregnancy, menopause, or due to certain medical conditions, can cause changes in scalp sensitivity.

8. Infections: Bacterial or fungal infections on the scalp can lead to inflammation, itching, and discomfort.

9. Nutritional Deficiencies: Lack of certain vitamins and minerals, such as zinc, vitamin D, or essential fatty acids, can affect scalp health, making it more sensitive.

If your scalp sensitivity persists or is severe, it might be helpful to consult a dermatologist or healthcare provider for a proper diagnosis and treatment plan.