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In December 2009, Johnson revealed that he had been battling Hepatitis C for over a decade, which resulted in slow speech and a tendency to regularly get "lost in thought in the middle of a discussion"
...it has ravaged his liver, resulted in thyroid problems and other health issues, including depression, for which he's also being treated. To keep the disease in remission, Johnson is going through an experimental treatment that he said has been the worst part so far.
He is being treated at Walter Reed Army Medical Center with a combination of interferon and ribavirin, which, like cancer chemotherapy, comes with many side-effects.