When seeing the GP for support with hallucinations, it will help to bring details of: People are less likely to hear voices that are not there when they are talking to someone real.
It may help to distract the person and see if this stops the hallucinations. Dehydration, constipation or infection can lead to delirium, a cause of hallucinations. Check that the person is not hungry, thirsty or uncomfortable. Gently leading someone away from where they are having the hallucinations can help make them disappear. Hallucinations may be limited to a particular setting. Ask them to describe their hallucination. Stay with the person and try to reassure them. Trying to convince someone that they are mistaken can lead to more distress. If this is still not possible, don’t argue with them – it will not help. If they cannot retain this information, repeat it when they are more relaxed. the person seems more confused than usual (which may be a sign of delirium). If the person’s hallucinations involve multiple senses, seek medical help immediately, as this can be a sign of serious illness. If a person is hallucinating, try the following tips. When a person is hallucinating, how you respond has a big impact on their experience and wellbeing. For more information see Dental care and oral health. If the person seems to be having gustatory hallucinations (tasting things that aren’t there), make sure they are getting regular dental check-ups to rule out other causes such as tooth decay or denture cream. The person may be having problems with their hearing, rather than hallucinating. If the person wears a hearing aid, check that it is working properly at the right setting, and encourage them to wear it. If the person seems to be having auditory hallucinations (hearing things that aren’t there), arrange to have their hearing checked. By changing or covering the carpet, the misperception may stop. For example, if they describe a ‘swarm of insects’, and there is a busy pattern on a carpet, it may be a misperception. Listen to what the person is describing, and check if anything could be causing what they are experiencing. Hallucinations differ from misperceptions or misidentifications. The following tips can help to identify hallucinations: Sometimes the person may appear to be hallucinating, but there is another cause (for example, it is a misperception instead). How can you tell if someone is hallucinating? It often depends on what they are hallucinating and how others respond. However, some people find the hallucinations pleasant or comforting. Hallucinations can be extremely distressing, and can lead to the person with dementia becoming frightened and in need of support. They often last for several minutes and happen often. Visual hallucinations are more common in people with dementia with Lewy bodies, and often take the form of complex, vivid and very realistic hallucinations of people or animals. gustatory hallucinations – tasting things that aren’t there, such as a metallic taste in their mouth. tactile hallucinations – physically feeling things that aren’t there, such as being kissed or insects crawling over their skin. olfactory hallucinations – smelling things that aren’t there, such as smoke or perfume. auditory hallucinations – hearing things that aren’t there, like voices or footsteps. Some people with dementia will have hallucinations in different senses – for example: How does a person experience hallucinations? 
Some people with worsening vision start to see things that aren’t there (visual hallucinations) because of their deteriorating sight and not from any other condition, such as dementia or a mental health problem. Speak to your GP before making any changes to medication. The drugs for Parkinson’s disease can often trigger hallucinations. Hallucinations are a rare side effect of many medications. Some people with delirium will have hallucinations. Diseases that cause inflammation and infection, such as pneumonia, can interfere with brain function and cause delirium. Hallucinations can also be caused by physical illness including fever, seizure, stroke, migraine and infection. People with Alzheimer’s disease can also have hallucinations. They are more common in people with dementia with Lewy bodies and Parkinson’s disease dementia.
Visual hallucinations are usually caused by damage to the brain.
People with dementia are often thought to be hallucinating when in fact they are simply mistaken about what they have seen (see Misperceptions and misidentifications, and dementia ). They can be simple (for example, seeing flashing lights) or complex (for example, seeing animals, people or strange situations). Visual hallucinations (seeing things that aren't there) are the most common type experienced by people with dementia. A hallucination is an experience of something that is not really there.
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