There are several reasons for dandruff on the head: 1, the usual diet is more on the greasy, spicy and stimulating side, thus producing more oil and grease, so there will be more dandruff on the head. 2, the usual habits of life, such as lack of sleep, prolonged late night, poor sleep quality, mental tension and relatively high mood swings, will also lead to seborrheic dermatitis, and its clinical manifestation will produce more dandruff. 3, excessive sebum secretion caused by endocrine disorders, which changes the normal pH value of the skin and reduces the skin’s antibacterial ability, producing more dandruff. 4, excessive cleaning usually makes more dandruff production.