Bruce Willis has been diagnosed with frontotemporal dementia (FTD), which is a rare condition that usually shows up earlier than other forms of dementia. FTD is a type of dementia that affects the frontal and temporal lobes of the brain, which are responsible for personality, behavior, and language. Willis was initially diagnosed with aphasia, which is a language disorder caused by damage to the areas of the brain responsible for expression and comprehension. Aphasia can be a symptom of FTD, and as Williss condition progressed, he was given a more specific diagnosis of FTD. FTD affects a persons ability to communicate, understand, and express spoken or written language, making it difficult to communicate. The Willis family has been open about his health journey, using it as an opportunity to raise awareness for his little-known disease.