I'm a Speech-Language Pathologist who works primarily with adults with concussion and brain injury. I have had many referrals for people with "problems mixing up words."

In my experience- I have to say it's mostly an attention issue. Chances are that you went to say one thing, like milk but in the split second before you said milk you thought about cheese and then said "cheese."

The main way to help this is to slow down when you talk and speak very deliberatly.

If this is happening more than 10 times a day it might be an issue- but for most people with PCS it happens less frequently and you just have to laugh it off or say, "You know what I mean."
Jena