Dementia refers to loss of cognitive function that affects memory along with the ability to think, solve problems and control emotions. Dementia itself is not a disease, but describes a group of symptoms caused by a brain disorder. There are numerous causes of dementia, including Alzheimer's disease, Huntingdon's disease and stroke. Since personality changes are common, living with dementia can be difficult for patients and caregivers alike. Learn more about dementia challenges and solutions with expert advice from Sharecare.