Is the most common and treatable of all mental illnesses.

Anxiety disorder is the most common and treatable of all mental illnesses.

Anxiety is a general term used for several kinds of disorders causing tension, nervousness, worrying, fear, apprehensions etc. These orders affect our behaviour and physical fitness as well like high blood pressure. Anxiety disorders are most common of all the mental illnesses in the U.S. and are highly treatable. These disorders develop due to various factors like life events, genetics, brain chemistry, personality etc.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.