Thinning hair isn't just a man thing. For many women of all ages, hair loss is a reality. And while men can opt to shave their heads, that's usually not an option for most women. An estimated 30 million women in the U.S. suffer from thinning hair. There are a number of factors that can contribute to hair loss: medication, illness, heredity, chemicals, poor diet, thyroid problems, stress... The list goes on...