The causes of particularly oily hair include seborrheic dermatitis, improper diet, staying up late, scalp damage, etc., so particularly oily hair is not necessarily a disease. 1. Seborrheic dermatitis: due to various factors triggering the scalp to secrete too much oil, so there will be hair especially love oil symptoms. 2. Improper diet: If the human body often eat greasy, high sugar food, long-term alcohol or like spicy stimulating diet, may also appear scalp secretion of excessive oil phenomenon. 3. Stay up late: when the human body often stay up late, this time can trigger endocrine system disorders, especially androgen secretion increases, which leads to increased oil secretion. 4. Scalp damage: due to various factors such as shampoo and other scalp damage, the scalp needs to secrete a lot of oil to protect the scalp, so the hair is particularly oily phenomenon. Finally, the phenomenon of particularly oily hair, please go to the hospital in a timely manner to check the cause of the disease in the doctor’s guidance on the symptoms of the treatment.