Many conditions can result in the temporary or permanent loss of eyebrow hair.
Some cancer chemotherapy drugs cause temporary hair loss, which affects all body hair. Along with the loss of scalp hair, people undergoing chemotherapy also commonly lose their eyebrows and eyelashes.
Hypothyroidism, or an underactive thyroid gland, adversely affects scalp and body hair growth. Thinning of the eyebrows can be a late sign of hypothyroidism.
Addressing the underlying cause of eyebrow loss usually results in hair regrowth. However, it may take weeks, or even months, before your brows start to grow back. If the hair does not grow back on its own, consider trying a hair-stimulating product, formulated for the eyebrow area. Additionally, hair transplant surgery is an option for restoring eyebrows.
An easy and effective way to camouflage a lack of brow hair is to draw in your brows with eyebrow pencils or powders. If you are unsure of how to create an attractive brow, use an eyebrow stencil to draw in the shape. Powder-based products create a more natural looking brow and particularly work well when there are some hairs left in the brow area. The powdered formula adheres to the hairs and creates a fuller looking brow. Tattooing the eyebrow area is another more permanent cosmetic option. Tattoos will however fade over time, so touch ups are usually necessary.