Aphasia
An acquired language disorder caused by damage to the brain, but does not affect intelligence.
A new word for me that I had never heard of before an MS diagnosis. It can affect anyone who has a neurological disease and is possibly caused by brain atrophy or old age.
Most of the time I feel reasonably intelligent, as long as I slow down in a conversation whether with one other person or a group. It can be very frustrating and embarassing to be in the middle of a sentence and completely lose my train of thought (brain fog) or when a particular simple word escapes me (aphasia). A close relative explained it this way: imagine a piece of your brain being completely taken out, never to return.
Aphasia is not a disability that can be repaired, but rather to be accepted, as just another result of the damage that a neurological disorder can cause.