What causes anxiety attacks?

You’re sitting calmly watching TV on a Saturday afternoon. Suddenly, things feel different. Something’s wrong, you think. You can’t pinpoint it but a feeling of nearby danger overwhelms you. You feel your temperature rise from warm to hot. Your heart beats faster. 90 beats per minute. 110 beats per minute. 130 beats per minute. You’re in full panic mode.

Have you ever had this experience? What you’re experiencing might be an anxiety attack.