Eyebrows growing downwards can be caused by heredity, hormones and uneven nutrition of local hair follicles. 1. Heredity: Eyebrows growing downwards can be considered to be caused by family heredity, there are genes in the family heredity that make the eyebrows grow downwards, after adulthood or middle-age, the eyebrows start to grow downwards, and in the old age the eyebrows are very long, and there is a longevity eyebrow. 2. Hormones: Hormonal influence can be taken into account in the growth of eyebrows. Male androgen secretion is more vigorous, which promotes the growth of body hair, and the eyebrows will grow faster, showing a tendency to grow downwards. 3. Uneven nutrition of local hair follicles: Eyebrows grow downward may be the local follicles of eyebrows uneven nutrition phenomenon, part of the hair follicles are overnourished, it will grow faster. If you are worried about your health, you can go to the hospital for a detailed examination.