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Perceptual disorders hallucinations auditory hallucination hypnagogic hallucination visual hallucination causes of hallucinations diagnosis of hallucination treatments for hallucinations

What are hallucinations?

Hallucinations are sensations that are not real. Any of the senses can be involved. A person may see, hear, taste, smell, or feel something that is not there. Hallucinations can be frightening for the person experiencing them and for those near them. If you are with someone who is having hallucinations, keep calm and seek medical care as soon as possible.

A hallucination occurs when environmental, emotional, or physical factors such as stress, medication, extreme fatigue, or mental illness cause the mechanism within the brain that helps to distinguish conscious perceptions from internal, memory-based perceptions to misfire. As a result, hallucinations occur during periods of consciousness. They can appear in the form of visions, voices or sounds, tactile feelings (known as haptic hallucinations), smells, or tastes.

Patients suffering from dementia and psychotic disorders such as schizophrenia frequently experience hallucinations. Hallucinations can also occur in patients who are not mentally ill as a result of stress overload or exhaustion, or may be intentionally induced through the use of drugs, meditation, or sensory deprivation. A 1996 report, published in the British Journal of Psychiatry, noted that 37% of 4,972 people surveyed experienced hypnagogic hallucinations (hallucinations that occur as a person is falling to sleep). Hypnopomic hallucinations (hallucinations that occur just upon waking) were reported by 12% of the sample.

Illusions are different from hallucinations. Illusions involve misinterpreting something that is real. Everyone experiences illusions at some time. They are generally not a cause for concern. People with only partial vision or partial hearing often experience illusions. This is because human brains have a natural tendency to fill in missing gaps. For instance, it is not unusual for elderly people to mistake the hum of an air conditioner for the murmur of voices.

More information on hallucinations

What are hallucinations? - Hallucinations are sensations that are not real. Any of the senses can be involved. Illusions are different from hallucinations.
What is auditory hallucination? - Auditory hallucination occurs when people hear voices or other noises although nothing is there. Auditory hallucinations can range from primitive noises to speech and music.
What is hypnagogic hallucination? - Hypnagogic hallucination is episodes of seeing and hearing things as one is falling asleep. Hypnagogic hallucinations can occur at sleep onset.
What is visual hallucination? - Visual hallucination is the most common type of hallucination in dementia. Visual hallucinations can start with misinterpretations.
What causes hallucinations? - There are numerous medical and psychiatric causes of hallucinations. Some of the common causes include drugs, stress, sleep deprivation and/or exhaustion.
How is hallucination diagnosed? - Aside from hypnogogic and hypnopompic hallucinations, more than one event suggests a person should seek evaluation.
What're the treatments for hallucinations? - Hallucinations that are symptomatic of a mental illness such as schizophrenia should be treated by a psychologist or psychiatrist.
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