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Donald Trump appears to be exhibiting many of the outward characteristics of Narcissistic Personalty Disorder (NPD). NPD is a defect in oneâs personality that manifests as an excessive mental preoccupation with oneself â usually to the detriment of everyone else.
1 Mental illness refers to all of the diagnosable mental disorders and is characterized by abnormalities in thinking, feelings, or behaviors. 2  Some of the most common types of mental illness include anxiety, depressive, behavioral, and substance-abuse disorders. 3  There is no single cause for mental illness. Some of the most common types of mental illness include anxiety, depressive, behavioral, and substance-abuse disorders. 2  There is no single cause for mental illness.