Anxiety: We don't know what specifically causes "brain chemical imbalance" -- or whether it actually causes anxiety or any other symptom. These are hypotheses only, and we don't even know which comes first (anxiety or brain changes). Anxiety workup includes general medical exams and diagnostic testing. Anxiety can also relate to heart, breathing, endocrine, & other problems, so these must be reviewed.
Answered 9/21/2017
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