Hallucinations are distorted sensory perceptions of what's happening around you. They usually involve visual or auditory changes, but can also relate to smell and touch.
Hallucinations take on various forms, including:
Involving hearing voices, such as a voice narrating your movements or actions, or two separate voices arguing between each other
Occurring when you see a different reality to that of others. You might see shadows, objects and people that aren’t really there, which can be particularly distressing
Some might think they're emitting strange odours or are rotting inside. The fear is compounded by a belief that other people can smell it as well