Over-plucking can lead to follicle damage which in turn causes permanent eyebrow hair loss. 

Nutrient deficiencies can negatively affect your hair follicles and lead to hair loss. 

Be sure to load up on hair-loving nutrients like iron and zinc and eat a protein rich diet that can help strengthen hair follicles and encourage cell growth and repair. 

As you get older, your eyebrows (and the hair on just about every part of your body) tends to get thinner and drier — making hair loss more common. 

Go easy on the eyebrow products that you use because they can easily weigh down on your eyebrows and cause them to break even faster. 

The thyroid gland controls the various parts of your body and if your thyroid count is low, it could affect the way your body reproduces keratin for hair. 

Also known as atopic eczema, this skin condition causes itchy, red and swollen skin that in turn, causes eyebrows to thin.