Possession by evil spirits?

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Possession by evil spirits and or Demonic possessions? Demonic possession, in supernatural belief systems, is a form of spiritual possession whereby certain malevolent extra-dimensional entities, demons, gain control over a mortal person's body, which is then used for an evil or destructive purpose. Unlike in channelling or other benign forms of possession, the subject has no control over the possessing entity and so it will persist until forced to leave the victim, usually through a form of exorcism. Many cultures and religions contain some concept of demonic possession, but the details vary considerably. Some cultures, in particular the Roma people also believe that demons can also possess animals, plants, deceased persons or inanimate objects. Now I personally Don't think anything like this ever happens. But I have always heard people telling this happening to their relatives close freinds. I Want to do some research and probally find out if this actually does happen or its just diseases like Schziphrenia, epilepsy, paranoia, postpartum psychosis and or postpartum depression because all these diseases and many other like these are just physcological disorders but are often mistaken as demonic possession or evil possession? But is it always a disease or evil spirits do exit and do take possession of people?