How to prevent my hair from being oily all the time?

Hormonal: Oily hair can be caused by hormones. Avoid triggering excess oil production by washing your hair with a milder shampoo and not one that strips the oils and use a light conditioner. Don't use super hot water which also strips oils. Try using a dry shampoo to blot the excess oils during the day and avoid using too much product as it can attract dirt to the oils already present.