When you’re anxious, your body makes a hormone called adrenaline. Adrenaline is the chemical that gives you a “fight or flight” response when you’re in danger. But if you feel anxious all the time, your brain doesn’t know the difference between dangerous and safe situations. It thinks you’re always in danger and continues to make adrenaline. This causes an imbalance that keeps your body feeling anxious, even when there's nothing to be afraid of.