Concussion
The most common kinds of aphasia associated with traumatic brain injury are amnestic aphasia and verbal paraphasia.  Amnesic aphasia, also known as anomia, is an issue with word finding where patients struggle to find words for objects that they once knew.  There is no impairment of comprehension associated with anomia. This can be especially challenging for students trying to return to school and professionals returning to work.  The second kind of aphasia associated with concussion is verbal paraphasia, the substitution of one word for another.  Typically, the substituted word will have a similar meaning as the word it replaces; e.g. substituting sock with shoe.