Head oil hair loss is usually divided into physiological and pathological, physiological head oil hair loss may be often stay up late, eat greasy food, the number of hair loss in 1 day within 100 is a normal phenomenon, followed by seborrheic dermatitis, androgenetic alopecia and other diseases. 1. Physiological factors: If you stay up late for a long time, live an irregular life or eat greasy food, it may lead to oil on the top of your head. The number of hair loss is normal if it is less than 100 hairs in a day, and usually no special treatment is needed. 2. Seborrheic dermatitis: It may be caused by Malassezia colonization and increased lipids. It occurs on the head, face, chest and back and other seborrheic areas. Clinical manifestations are yellowish-red patches with greasy scales, often accompanied by vesicles and oozing. If it occurs on the scalp, it may cause oily hair loss on the top of the head. 3. Androgenetic alopecia: the cause of the disease may be related to androgens, heredity and other factors, the patient will appear hair thinning, sparse, and gradually fall out of the situation, most often accompanied by an increase in the secretion of scalp oil. There may be other causes of oily hair loss on the top of the head, after excluding physiological factors, it is recommended that the patient seek medical examination to clarify the cause of the disease and timely treatment.