Anxiety can occur as a symptom of depression and depression can be caused by an anxiety disorder. Anxiety and depression frequently coexist. Dr. Grohol (2008) emphasized it is important that both anxiety and depression (anxious-depression) be assessed (evaluated or tested) and as warranted, treated. The World Health Organization ICD-10 describes mixed anxiety and depression disorders (Wikipedia). The symptoms of anxiety and depression disorders resemble those presented in DSM-5 (2013). This emphasizes the importance of screening both anxiety and depression when clinically screening patients.
Brady & Sinha (2005) noted “The high rate of co-occurrence of psychiatric disorders is well established.” The importance of adequately assessing both anxiety and depression is very important.