Home > Medical > Symptoms Updated 11 February 2013 Hallucinations A hallucination is a sensory experience, while you are awake and conscious, without any corresponding cause in the external world which could be shared by others. 0 Definition A hallucination is a sensory experience, while you are awake and conscious, without any corresponding cause in the external world which could be shared by others. So it would include hearing a voice when nobody is speaking and no-one else could hear it; or seeing a person or object which nobody else near you can see. There can also be hallucinations of touch (such as feeling things crawling over your skin, when there are none); hallucinations of smell or taste occur, but less commonly, and may be more typical of the aura that warns that an epileptic fit is imminent. Other names Seeing or hearing things. Possible causes Psychotic illnesses such as schizophrenia, or very severe depression or bipolar disorder, or post-traumatic stress disorder. Sleep deprivation; fever; temporal lobe epilepsy, or the aura preceding an epileptic fit. Some brain tumours. Severe physical illness in which one is delirious, such as liver or kidney failure. Sensory deprivation in which one is, temporarily or permanently, blind or deaf. Intoxication by or withdrawal from various drugs and substances of abuse - such as cocaine, or amphetamine, alcohol (especially in delirium tremens). Hallucinations may be entirely normal in bereavement, in the form of briefly seeing or hearing the loved person who has recently died - but these are brief, and the person experiencing them recognises that they are not real. Other normal hallucinations include hypnagogic hallucinations which can occur as one is falling asleep, and hypnopompic hallucinations which occur when one is waking up. These are brief, and one rapidly recognises that they don't represent reality. Homecare/self-treatment Not safe until a cause has been established by a doctor, and is being properly treated. While this is being arranged, do not leave the person alone, speak calmly and soothingly, letting them know what is being done. Don't get over-anxious or talk behind their back. When to see a doctor When you recognise that this is what you are experiencing, or when family or friends tell you that this is what is happening to you. When someone in the family starts to hallucinate, arrange for them to see a doctor as soon as possible, and do not leave them alone. What to expect at the doctor A careful history and physical examination, perhaps blood and urine tests to check for a number of possible physical illnesses. Treatment This, of course, depends on the cause of the hallucination. Treatment obviously needs, where possible, to focus on clearing up the cause of these experiences. Anti-psychotic medications may help to remove or at least reduce the disturbance caused by the presence of hallucinations. NEXT ON HEALTH24X More evidence flu vaccine is safe during pregnancy 2019-07-12 12:00 More: MedicalSymptoms advertisement Read Health24’s Comments Policy Comment on this story 0 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... Other news Fitness Even age 80 is not too late to begin exercising Medical WATCH: Blood pressure in our 30s has lasting impacts Lifestyle WATCH: Is 5G slowly killing us? Medical Scientists discover new way fat harms your arteries Diet and nutrition 9 common mistakes people make when it comes to weight loss, according to a celeb trainer Sex Is a chlamydia vaccine on the horizon? Live healthier Heart health » 5 women share exactly what it feels like to have a heart attack 'I felt like I had a pill stuck in my throat.' Diet & Nutrition » 8 benefits of gherkin juice that will make you want to drink some ASAP Goodbye, salt craving.