"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you’ve ever experienced tight muscles, a racing heart, or difficulty focusing on simple tasks, you’re not alone—these are all common signs of stress. And even when you feel fine, those familiar symptoms can creep up at any moment. Stress can feel like it’s taking over some (or all) aspects of your life, and that’s not great news for your health.