Aphasia is a serious medical issue, not just forgetting words. After the accident, his aphasia made conversation difficult.
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Brain Damage
Aphasia usually results from damage to parts of the brain responsible for language. Her aphasia was caused by brain injury, not by choice.
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Different Types
Aphasia types like expressive or receptive vary in symptoms—affecting speaking or understanding. He has expressive aphasia; he knows what he wants to say but can't vocalize it.