Delusions (or strongly held false beliefs) are a common symptom for a person with dementia. They can take the form of paranoia, which makes the person feel threatened, even if there is no or little ...

A delusion is a fixed, relatively immutable, persistent, false belief with no basis in reality. Source: Piotr Marcinski/Shutterstock We talk often about "deluded" people: “The person on the talent ...

Delusions of grandeur are false beliefs in which people think they are God-like, powerful, or invincible. A person with ...

Around the year 1400, the French king Charles VI began to exhibit a number of disturbing behaviors that eventually earned him the nickname "Charles the Mad." Among these behaviors, he refused to let ...