Elderly patient with significant smoking history who presents with cachexia (secondary to decreased appetite), decreased interest in smoking, abnormal mental status examination, slow speech, and cognitive dysfunction concerning for lung cancer vs. major depressive disorder, but patient has a normal chest x-ray which is more consistent with major depressive disorder and therefore patient should have suicide risk assessment (performed in all patients with depression)
Key idea: Major depression leads to at least 5 of the depressed mood + SIGECAPS symptoms for at least 2 weeks
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