What Is Anxiety?

Liam had always looked out for his younger brother Sam. But whenever Sam took the late bus after soccer practice, Liam worried about him so much he couldn’t concentrate on his homework. Liam watched the clock, worrying and imagining the worst — picturing bus accidents and fearing, for no particular reason, that Sam might be injured or dead. Only when Sam arrived home safe could Liam finally relax.

It’s completely normal to worry when things get hectic and complicated. But if worries become overwhelming, you may feel that they’re running your life. If you spend an excessive amount of time feeling worried or nervous, or you have difficulty sleeping because of your anxiety, pay attention to your thoughts and feelings. They may be symptoms of an anxiety problem or disorder.

Anxiety is a natural human reaction that involves mind and body. It serves an important basic survival function: Anxiety is an alarm system that is activated whenever a person perceives danger or threat.

When the body and mind react to danger or threat, a person feels physical sensations of anxiety — things like a faster heartbeat and breathing, tense muscles, sweaty palms, a queasy stomach, and trembling hands or legs. These sensations are part of the body’s fight-flight response

. They are caused by a rush of adrenaline and other chemicals that prepare the body to make a quick getaway from danger. They can be mild or extreme.

The fight-flight response happens instantly when a person senses a threat. It takes a few seconds longer for the thinking part of the brain (the cortex) to process the situation and evaluate whether the threat is real, and if so, how to handle it. If the cortex sends the all-clear signal, the fight-flight response is deactivated and the nervous system can relax.

If the mind reasons that a threat might last, feelings of anxiety might linger, keeping the person alert. Physical sensations such as rapid, shallow breathing; a pounding heart; tense muscles; and sweaty palms might continue, too.

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