Many women who enter their doctor's office with complaints of hair thinning and hair loss often walk out with a thyroid disorder diagnosis. If your thyroid hormone levels are too low (hypothyroidism) or too high (hyperthyroidism), hair loss is a telling symptom that your levels are out of whack. "You'll usually find large amounts of hair falling out in the shower or sink, often accompanied by changes in the hair's texture -- drier than usual, more coarse or easily tangled -- these are all common symptoms of a thyroid disorder," Marotta explains.

Solve It:
If you suspect your thyroid is to blame, have your doctor check your thyroid levels, which can be done through a simple blood test. Fortunately, when it comes to hypothyroidism and hyperthyroidism, hair will return to its natural state once the thyroid imbalance is treated.