Dr. Amanda explains what narcissism and other personality disorders are and why they can be very destructive to these people and others. Personality disorders are more than your average bad moods or habits and they are quite common. They are in our families, workplaces, and communities. Even though the difficult person you are dealing with may not be a murderer – or psychopath – disordered personalities can cause tremendous harm in all areas of our lives. They can disrupt our mental and financial health, our relationships, families, and careers. Because the risks they pose are real – like any risk in life, it's smarter to be aware and able to protect ourselves than not.