There are many reasons for excessive hair oil, such as greasy and spicy food and hair oil caused by bad habits. For example, eating high-fat and high-calorie foods often will stimulate the secretion of sebaceous glands, resulting in excessive head oil. In addition, staying up late, playing computer for a long time, fast-paced life and high-intensity work pressure will all affect the endocrine system and aggravate scalp oil production. In addition, if you wash your hair too often, you will get oil if you don't wash your hair for a long time. Shampooing frequency is too frequent. According to the data, oil is mainly secreted by sebum. Frequent shampooing will wash off the oil on the scalp, and sebum will receive the information of oil shortage, and then further secrete oil, leading to more and more secretion, leading to more and more serious scalp oil. The use of shampoo can't be controlled, but it will aggravate the oil, so you must be careful when choosing shampoo, choose the shampoo that suits you, and avoid excessive oil on your head.