Smile Mask Syndrome is a psychological disorder in which subjects develop depression and physical illness as a result of prolonged, unnatural smiling. First described in Japan in 1983, this is attributed to the great importance placed on smiling in the Japanese service industry.
A psychological condition called “Koro” makes sufferers believe that their genitals have been stolen.
There’s a psychological disorder where you believe that you and everyone you love is already dead. Patients with Cotard’s Disorder often stop eating and believe that they are in heaven or hell.