Causes
The changes in the brain that cause dementia can be caused by various physical illnesses, including circulatory disorders, certain thyroid diseases, chronic poisoning, for example due to excessive alcohol or drug consumption. Brain tumors can also affect the activity of the brain and lead to dementia.
Doctors often speak of a so-called multifactorial event, i.e. a variety of causes for the development of dementia. Widespread conditions such as high blood pressure or diabetes, for example, can negatively influence an existing dementia or cause the initial damage to blood vessels in the brain.