Dementia might cause people to retreat from occupations and interests that they formerly liked. Memory loss and cognitive ability issues can make it more difficult for persons to do daily chores. Cognitive rehabilitation, a type of therapy derived from that provided to persons who have had brain damage, is thought to help people with dementia cope with some of the challenges they confront. The rehabilitation therapy for people with Alzheimer's varies depending on the symptoms, manifestations, and progression of the disease, as well as the difficulty in diagnosing Alzheimer's. These factors influence the amount and type of help required by Alzheimer's patients and their families.