A hallucination is a sensory perception(ie voice/noise, vision, tactile, smell/olfaction or taste) in the absence of an external stimuli/source. Auditory then visual hallucinations are the most common type of hallucination found in psychiatric disorders (schizophrenia, bipolar disorder, major depression with psychotic features). Olfactory, gustatory(taste) and tactile hallucinations are often more indicative of a physical conditon such as alcohol withdrawal and seizure disorders.
Hypnagogic hallucination is a sensory perception in the absence of a stimuli that occurs upon awakening from sleep such as hearing a noise. This is a normal occurence in many people on occasion. I suggest that you discuss this issue further with your primary care physician. Good luck.
I have heard that olfactory hallucinations cand be cause by a few things.
1. Now don't panic, you would know if you were like this. Sometime olfactory hallucinations can be caused by other mental disorders, even head traumas. It is sometimes linked with personality disorders like schizophrenia.
2. Mediactions sometimes cause strange side effects.
3. You might have a physical porblem with you nose or your olfactory nerve.
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