5. Capgras Delusion
Capras Delusion, named after Joseph Capgras, a French psychiatrist who was fascinated by the illusion of doubles, is a debilitating mental disorder in which one believes that the people around them have been replaced by imposters. This is one of the most fascinating anxiety disorders to date. People suffering from this severe mental disorder believe that these imposters are usually thought to be planning to harm the sufferer. In one case, a 74-year old woman with Capgras Delusion began to believe that her husband had been replaced with an identical looking imposter who was out to hurt her. Capgras Delusion is relatively rare, and is most often seen after trauma to the brain, or in those who have been diagnosed with dementia, schizophrenia, epilepsy, or an anxiety disorder.
6. Clinical Lycanthropy
Like those with Boanthropy (described above), those who suffer from Clinical Lycanthropy also believe themselves to be able to turn into animals — in this case, wolves and werewolves, though occasionally other types of animals are included. Along with the belief that they can become wolves, people with Clinical Lycanthropy also begin to act like an animal, and are often found living or hiding in forests and other wooded areas.
Clinical Lycanthropy is a very rare psychotic disorder and is typically brought on by other mental health conditions. Experts believe it is a psychotic episode caused by schizophrenia, bipolar disorder, or a depressive disorder.