The scalp can get greasy often due to several reasons: Overactive sebaceous glands: The sebaceous glands in your scalp produce natural oils called sebum, which help to keep your hair and scalp moisturized. However, if your glands are overactive, they can produce too much sebum, making your scalp and hair look greasy. Hormonal changes: Hormonal changes, such as puberty, pregnancy, or menopause, can affect the activity of the sebaceous glands, leading to an increase in sebum production. Poor hair hygiene: If you don't wash your hair regularly, the excess oil, dirt, and sweat can accumulate on your scalp, leading to greasiness. Diet: A diet high in fatty and processed foods can lead to excess sebum production, making your scalp and hair greasy. Certain hair products: Some hair products, such as styling gels and mousses, can contain ingredients that can clog the hair follicles, leading to an increase in sebum production and greasiness. To prevent greasy scalp, it's important to maintain good hair hygiene by washing your hair regularly, using a gentle shampoo, and avoiding hair products that can clog the hair follicles. Additionally, maintaining a healthy diet and lifestyle can also help to reduce excess oil production.