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Helaina Hovitz is a native New Yorker, editor, journalist, and author of the memoir "After 9/11." Helaina has written for The New York Times, Forbes, Teen Vogue, Glamour, Huffington Post, Women's Health, Bustle, Prevention, Thrillist, VICE, HEALTH, Salon, SELF, the Daily Meal, and many others. Follow her on Twitter @HelainaHovitz and Facebook/HelainaNHovitz.

13 Signs You Could Have Post-Traumatic Stress Disorder

If you've ever been through something dangerous, shocking, extremely unsafe or life-threatening, look out for these subtle changes in your everyday life that could be signs of post-traumatic stress disorder.