A brain syndrome called mirrored touch synaesthesia causes people to physically feel what other people are feeling just by looking at them. For example, a person can look at a dog and fee fur texture on his palms, this is an involuntary response. Brain automatically fills in what it thinks the dog feels like without needing to touch it. Sometimes people also have mirror-taste, so they can look at something and “taste” it in their mouth.
There is a disease called “Sudden unexpected death syndrome” where the heart of a seemingly healthy adult just stops for no reason. It mostly affects young men in select Southeast Asian countries.
There is a syndrome called the Capgras Delusion, where if you suffer from it you may think your friends, family, and even your pets have been replaced by impostors.
Sudden unexpected death syndrome is unexpected death of adolescents and adults which inspired Wes Craven to create Nightmare on Elm Street.
Annually Paris experiences nearly 20 cases of mental break downs from visiting Japanese tourists, whom cannot reconcile the disparity between the Japanese popular image of Paris and the reality of Paris.
There is a girl that does not seem to age and her condition is actually called Syndrome X.
There exists a Broken Heart Syndrome that could potentially kill you.