How do you know if a spirit is trying to attach itself to you or posses you?

Before you comment about this being stupid or that it doesn't exist, I know people who have been possessed and my inner family have seen it happening to another family first handed. I don't want to talk to them about this, but I just need answers. If you are religious, may you please let me know signs? I'm not saying I'm possessed or something, but I am starting to question if something wants to inhabit my body or trying to attach itself to me. So please help me.
How do you know if a spirit is trying to attach itself to you or posses you?
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