it can be any number of normal, mental or physical health problems. example of normal hallucination...some people can daydream so clearly and in such detail that for them it can cross over into being a hallucination. the brain normally does have sensory hallucinations. a very common one is think about a favorite food. think about how it smells, feels and tastes and suddenly your brain processes these thoughts to the point where you can actually start smelling , tasting feeling that food without actually having it right there in your hand. this can happen with just about anything we experience on a daily basis.

from there hallucinations can be part of any physical health problem and just about every mental disorder there is.

my suggestion anyone who feels they may be having hallucinations may want to contact their treatment providers for assessment and treatment options.