Hallucinations and causes

From: http://www.wrongdiagnosis.com/sym/hallucinations.htm#possible

Hallucinations occur when a person believes that they experience something that does not physically exist. Hallucinations can be visual (seeing), auditory (hearing), or even affect the senses of touch or taste. Hallucinations are a serious symptom that needs prompt professional medical advice for diagnosis and treatment.

Some of the more common possible causes of hallucinations include:

  • Drug intoxication
  • LSD intoxication
  • Marijuana intoxication
  • Cannabis
  • Psychotic disorder - see below.

Psychotic disorders - these are typified by hallucinations and/or delusions.

  • Schizophrenia
  • Schizotypal personality disorder
  • Schizoid personality disorder
  • Brief psychotic disorder
  • Bipolar disorder - previously known as "manic-depressive disorder"
  • Mania - if causing psychosis
  • Drug-induced psychoses

Some of the less common possible causes of hallucinations include:

  • Grief - will rarely cause hallucinations in very severe grief.
  • Postpartum psychosis
  • Korsakoff's psychosis
  • Hallucinogen Persisting Perception Disorder - causing flashbacks after use of hallucinogen drugs.

Alcohol abuses

  • Alcohol poisoning (type of Poisoning)
  • Delirium tremens
  • Alcoholic hallucinosis

Physical medical conditions that may lead to hallucinations include:

  • Extreme physical stress
  • High fever (see Fever)
  • Dehydration
  • Extreme fatigue (see Fatigue)
  • Kidney failure

Brain disorders

  • Dementia - see causes of dementia
  • Delirium - see causes of delirium
  • Confusion
  • Alzheimer's disease
  • Stroke
  • Migraine
  • Brain tumor
  • Seizures
  • Temporal lobe epilepsy (type of Epilepsy) - sometimes hallucations of smell or taste.

Eye disorders - may cause various visual effects which might be described as visual hallucinations.

  • Cataracts
  • Glaucoma
  • Retinal ischemia
  • Optic nerve lesion

Sensory organ disorders - causing hallucinations of the various senses.

Certain medications