White very thin and very long hairs grow on the body, mostly considered to be a normal physiological phenomenon, vitiligo, albinism and other conditions. 1. Physiological phenomenon: with age, the melanin in the hair follicle will become less and less, so the hair will become white, in the beginning it may be only partially white, so there will be white very fine and very long hairs growing on the body. 2. Vitiligo: If due to some reasons, the melanocytes are destroyed, it will lead to the decrease of melanin to appear vitiligo, mainly there will be a piece or several white patches of different sizes, in the range of white patches, the hairs are also white. 3. albinism: albinism is a hereditary disease, usually from childhood, mainly will appear in the eyes and skin symptoms, in the skin is mainly white or pink color, usually hair is also relatively white. The white, very fine and very long hairs on the body may also be caused by other reasons, it is recommended to consult a doctor in time to clarify the cause of standardized treatment.