Long white hairs on eyebrows may be caused by physiological phenomenon, early stage of vitiligo, albinism and other reasons. 1. Physiological phenomenon: with age, the ability of melanocytes in the skin to synthesize melanin decreases or the number of melanocytes decreases, leading to a decrease in melanin in the skin, which also affects the color of the hair, thus making the hair white, so the eyebrow may grow white hairs. It is generally a normal physiological phenomenon, no need to worry too much. 2. Vitiligo: the disease is a pigment loss disease, may be related to heredity, mental nervousness, autoimmune dysfunction and other factors, affecting melanin synthesis in the skin, resulting in white skin, white hair, so may cause the phenomenon of long white hair on the eyebrow. 3. Albinism: this disease may be related to autosomal recessive inheritance, the general symptoms of some of the skin color is white or pink, vision loss, hair white or brown and other phenomena, so the above symptoms may occur. In addition to the above, white hairs growing out of the eyebrows may also be due to genetic factors, it is recommended to go to the regular hospital in time to find out the cause and symptomatic treatment.