Every three seconds, a person is diagnosed with dementia in the world. Today, 47 million people suffer from this disease, but this number should be three times greater in 2050. Currently, there are almost 55,000 people living with dementia in Ireland; 19,800 men and 35,650 women 4,000 of these people are under 65 and are classified as having younger onset dementia (Trépel, 2011). It is estimated that the number of people living with dementia will rise to 153,157 by 2046 due to population aging. Approximately 4,000 cases of dementia are identified in Ireland each year, there are approximately 50,000 family carers caring for someone with dementia for each person diagnosed with dementia there were at least three family members directly affected The psychological and behavioural symptoms of dementia are a term used to describe a variety of psychological and behavioural reactions that occur in people with dementia of any etiology. It can also be called non-cognitive aspects of dementia since such terminology refers specifically to the behaviour of the inherent subject to the symptom that causes pathologies. The psychological aspects of dementia constitute a psychopathological disorder other disorders of the third age and can be found in the varied etiological forms insanity. It ranges from psychotic symptoms (delusions and hallucinations), depression, insomnia, apathy and agitation, aggression, hypersexuality and wandering behaviour. In relation to the psychological aspects, the hallucinations produce changes of thought such as Objects, people, animals and lights that do not fit into reality and that only the individual perceives. Delusions are mistaken beliefs but held with great conviction and that usually manifests itself in dementia, we can use as an example: The delusions religious, megalomania, erotomania, paranoia and pathological jealousy. Depression is demonstrated by its apparent emotional aspect, one perceives sadness, anguish, dissatisfaction, lack pleasure in previously enjoyable activities, feelings of guilt and low self-esteem, there is also loss of energy and changes in sleep and appetite. Apathy is characterized by a lack of initiative and indifference towards all aspects of life. The patient with this symptom refers more often to certain neutrality about its own existence.