Dementia describes a failure of brain functioning. It s a broad term for a range of symptoms, most notably memory loss, that result from brain damage. Dementia may be caused by a number of illnesses that affect the brain. Dementia typically leads to memory loss, inability to do everyday things, difficulty in communication, confusion, frustration, as well as personality and behaviour changes. People with dementia may also develop behavioural and psychological symptoms such as depression, aggression and wandering. I suggest to consult a physician to be examined and get the tests done and to findout the real cause for above problem.