Those who have written on this topic have listed several symptoms of jinn possession. These symptoms may be real, but we must point out that some of these symptoms may also occur for other reasons, such as staying up all night, or confusion and uncertainty. So we must try to protect ourselves from the whispers that the Shaytaan tries to instil in our hearts, when reading this list of symptoms.
These symptoms have been divided into two categories: those which occur when one is awake, and those which occur when one is asleep.
And whosoever turns away blindly from the remembrance of the Most Gracious (Allah) (i.e. this Qur'an and worship of Allah), We appoint for him Shaytaan (Satan - devil) to be a Qareen (a companion) to him. And verily, they (Satans/ devils) hinder them from the path (of Allah), but they think that they are guided aright! Al-Qur’an, 43:36-37)
There are other signs when one is awake, but they may be caused by other life circumstances, such as not succeeding in efforts to get married, repeatedly failing to do so, or a wife becoming very distressed when her husband has intercourse with her.
Please Note: A person should not be regarded as being possessed by the jinn if any of these symptoms occur. No one can be certain that a person has been possessed by the jinn until after the Qur'an has been recited over them, so these symptoms cannot be taken as definitive evidence of jinn possession.
Extracts Compiled From:
The Jinn & Human Sickness by Dr Abu’l-Mundhir Khaleel Ibn Ibrahim Ameen