What is aphasia? Bruce Willis is 'stepping away' from acting after diagnosis

Bruce Willis' decision to end his acting career of more than four decades after a recent aphasia diagnosis has put a spotlight on the somewhat rare disorder.

Aphasia describes a neurological condition that affects a person’s ability to communicate verbally or through writing.

Willis' daughter Rumer Willis posted Wednesday on Instagram that the condition has affected her father's "cognitive abilities."

"As a result of this and with much consideration Bruce is stepping away from the career that has meant so much to him," the post said.

Willis, an Emmy-winning actor and the star of hit movies like "Die Hard" and "The Sixth Sense," turned 67 this month.

What causes aphasia?
Aphasia is caused by damage to one or more areas of the brain that deal with language, according to the National Institutes of Health.

What are aphasia’s symptoms?
In the most serious cases, the condition can “make communication with the patient almost impossible,” according to the National Aphasia Association.

Is aphasia treatable?
Some Forms Of Aphasia Can Be Treated And Reversed If Caught Early. But The Aphasia Association Said Complete Recovery Is Unlikely If Symptoms Remain Two Or Three Months

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