People with HIV and AIDS sometimes develop cognitive impairment, particularly in the later stages of their condition.

Creutzfeldt-Jakob disease (CJD) is caused by an abnormally shaped protein called a prion infecting the brain.

Here you will find a list of other useful organisations that may be able to provide you with further information about rarer types of dementia.

Progressive supranuclear palsy (PSP) is a rare condition that causes both dementia and problems with movement.

Posterior cortical atrophy (PCA), also known as Benson's syndrome, is a rare degenerative condition in which damage occurs at the back (posterior region) of the brain. In the vast majority of people, the cause of PCA is Alzheimer's disease.

People with Parkinson's disease are more likely to develop certain types of dementia. Find out about the causes, symptoms and treatments.