Since his retirement, Carson has lived with various physical maladies brought on by injuries incurred during his playing days. He was diagnosed with post-concussion syndrome in 1990, and estimates that he had 15 concussions during his long high school, college and professional football career. In 1992, he stated: "I don't think as clearly as I used to. Nor is my speech, diction, selection of vocabulary is as good as it used to be, and I don't know why." In 2001 while he was a broadcaster with the MSG Network he said, "I would mispronounce words and lose my train of thought. Things would happen, and at times I'd think I was going crazy."