It can come from any event or thought that makes you feel frustrated, angry, or nervous. Stress is your body's reaction to a challenge or demand. In short bursts, stress can be positive, such as when it helps you avoid danger or meet a deadline. But when stress lasts for a long time, it may harm your health.

Where does most stress come from in the body?

In your brain, the hypothalamus gets the ball rolling, telling your adrenal glands to release the stress hormones adrenaline and cortisol. These hormones rev up your heartbeat and send blood rushing to the areas that need it most in an emergency, such as your muscles, heart, and other important organs.

What causes stress for no reason?

Anxiety can be caused by a variety of things: stress, genetics, brain chemistry, traumatic events, or environmental factors. Symptoms can be reduced with anti-anxiety medication. But even with medication, people may still experience some anxiety or even panic attacks.