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.
It's natural for new, unfamiliar, or challenging situations to prompt feelings of anxiety or nervousness. Facing an important test, a big date, or a major class presentation can trigger normal anxiety. Although these situations don't actually threaten a person's safety, they can cause someone to feel "threatened" by potential embarrassment, worry about making a mistake, fitting in, stumbling over words, being accepted or rejected, or losing pride.
Anxiety disorders are among the most common mental health conditions. They affect people of all ages — adults, children, and teens. There are many different types of anxiety disorders, with different symptoms. They all have one thing in common, though: Anxiety occurs too often, is too strong, is out of proportion to the present situation, and affects a person's daily life and happiness.