Actor Bruce Willis has been diagnosed with frontotemporal dementia, his family announced Tuesday.

The diagnosis comes after Willis, 65, had been battling aphasia, a language disorder, for several months.

Frontotemporal dementia, also known as FTD, is a rare neurodegenerative disorder that affects the frontal and temporal lobes of the brain. It can cause changes in behavior, language, and personality.

“It is a cruel disease,” said a statement from the Willis family. “Our hearts are broken.”

The statement went on to say that Willis is receiving treatment and is surrounded by his family and friends.

“We are asking for privacy and compassion during this difficult time,” the statement said.

The Willis family’s announcement has been met with an outpouring of support from fans and celebrities alike. Many have taken to social media to express their well wishes for the actor.

“My thoughts and prayers are with Bruce Willis and his family during this difficult time,” wrote actor Ashton Kutcher on Twitter.

Willis is best known for his roles in “Die Hard,” “Pulp Fiction,” and “The Sixth Sense.” He has been nominated for four Golden Globe Awards and two Emmy Awards.