Demonic possession is held by many belief system

Belief system

A belief system is a set of mutually supportive beliefs. The beliefs may be religious, philosophical, ideological or a combination of these.The British philosopher Stephen Law has described some belief systems as "claptrap" and said that they "draw people in and hold them captive so they become...

s to be the control of an individual by a malevolent supernatural being

Demon

call - 1347 531 7769 for more infoIn Ancient Near Eastern religions as well as in the Abrahamic traditions, including ancient and medieval Christian demonology, a demon is considered an "unclean spirit" which may cause demonic possession, to be addressed with an act of exorcism...

. Descriptions of demonic possessions often include erased memories or personalities, convulsions, “fits” and fainting as if one were dying. Other descriptions include access to hidden knowledge (gnosis

Gnosis

Gnosis is the common Greek noun for knowledge . In the context of the English language gnosis generally refers to the word's meaning within the spheres of Christian mysticism, Mystery religions and Gnosticism where it signifies 'spiritual knowledge' in the sense of mystical enlightenment.-Related...

) and foreign languages (glossolalia

Glossolalia

Glossolalia or speaking in tongues is the fluid vocalizing of speech-like syllables, often as part of religious practice. The significance of glossolalia has varied with time and place, with some considering it a part of a sacred language...

), drastic changes in vocal intonation and facial structure, the sudden appearance of injuries (scratches, bite marks) or lesions, and superhuman strength.