Premature graying.
Feel a little too young for those silvery strands of hair you’ve been noticing? Maybe you are. But, first, check with your parents and see when they started to go gray because premature graying is yet another thing we can usually blame on them. If you find it can’t be chalked up to heredity, you could be suffering from anemia (a lack of iron), a thyroid imbalance, or a vitamin B12 deficiency—all things that can be determined from a few simple tests at the doctor’s office.

The urge to pull out your hair.
Experts estimate that between six and eight million Americans suffer from Trichotillomannia, a condition that causes people to obsessively pull out their hair. If you find yourself regularly pulling out your strands, you’re likely suffering from this condition. Since it’s a form of obsessive-compulsive disorder, seeing a psychiatrist is the best way to figure out what’s going on. “My psychiatrist helped me realize that it was stress-induced and suggested behavior modification methods, like snapping a rubberband on my wrist, to stop myself from doing it,” says Mia Beemiller, 23.