Rare Mental Disorders - Top 10 Rarest Mental Disorders in the World Think of rare Metal diseases? You might not have heard of Stendhal syndrome or Wendigo psychosis, but these diseases, syndromes and disorders don’t feel ‘rare’ to the people and families afflicted with them. Although the exact cause of most mental illnesses is not known, it is becoming clear through research that many of these conditions are caused by a combination of genetic, biological, psychological, and environmental factors — not personal weakness or a character defect — and recovery from a mental illness is not simply a matter of will and self-discipline. Let me take you through these top 10 lists of bizarre, rare but real mental disorders. 10- Phantom limb syndrome is the perception of sensations, including pain, in a limb that has been amputated. People with this condition experience feelings in the limb as if it were still attached to their body. 9- Synesthesia is a condition in which one sense (for example, hearing) is simultaneously perceived as if by one or more additional senses such as sight. Another form of synesthesia joins objects such as letters, shapes, numbers or people’s names with a sensory perception such as smell, color or flavor. 8- Triskaidekaphobia, or fear of the number 13, does not fit neatly into a clinical definition of a specific phobia. The number 13 is not an object or a situation, and it can be impossible for the sufferer to avoid. 7- Foreign accent syndrome (FAS) is speech disorder that causes a sudden change to speech so that a native speaker is perceived to speak with a “foreign” accent. The FAS is most often caused by damage to the brain caused by a stroke or traumatic brain injury. 6- Stendhal syndrome is a psychosomatic disorder that causes rapid heartbeat, dizziness, fainting, confusion and even hallucinations when an individual is exposed to an experience of great personal significance, particularly viewing art. 5- The Capgras delusion is a disorder in which a person holds a delusion that a friend, spouse, parent, or other close family member has been replaced by an identical-looking impostor. 4- The Wendigo is a demonic half-beast creature appearing in the legends of the Algonquian peoples along the Atlantic Coast and Great Lakes Region of both the United States and Canada. 3- Cotard’s Delusion is a mental disorder where people suffer the nihilistic delusion that they are dead or no longer exist. First reported in the 1700s, the disorder is still largely a mystery today. 2- Alice in Wonderland syndrome is a disorienting neurological condition that affects human perception. Sufferers may experience micropsia, macropsia, or size distortion of other sensory modalities 1- Jerusalem syndrome is a group of mental phenomena involving the presence of either religiously themed obsessive ideas, delusions or other psychosis-like experiences that are triggered by a visit to the city of Jerusalem. "10 Rare Mental Disorders"Top 5 Bizarre Mental Disorders"10 Incredibly Rare Diseases"Top Ten Weirdest Mental Disorders"Top 7 Most Insane and Weirdest Mental Disorders"