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When something scares you suddenly, like a loud noise, it triggers stress hormones (adrenaline, noradrenaline, cortisol) that make your heart beat faster and harder. You may feel like it's beating unevenly (heart palpitations). Over time, if it happens too much, you're more likely to have high blood pressure, heart disease, hardened arteries, high cholesterol, stroke, and heart attack. Along with a pounding heart, you might start breathing more quickly when you're scared or anxious, or feel like you can't get enough air. Some people breathe so fast that they get light-headed or pass out. It can be serious if you already have breathing problems because of asthma, lung disease, chronic obstructive pulmonary disease (COPD), and other conditions. It's a set of symptoms you get when you react to something scary. Your fright triggers the release of certain hormones that send signals through your brain, spinal cord, and nerves. Blood and fuel (glucose) floods to your arms ...