Haynesworth played 10 seasons in the NFL. He spent his first seven seasons with the Titans, who selected him No. 15 overall in the 2002 draft out of Tennessee. Haynesworth also played for Washington (2009-10), New England (2011) and Tampa Bay (2011).
He was selected as an All-Pro after the 2007 and 2008 seasons and had 30 sacks in 123 games.
Haynesworth had his greatest season in 2008, when he had 8 sacks while leading the Titans to a 13-3 record and the No. 1 overall seed in the AFC before they lost to the Baltimore Ravens in the divisional playoffs.
This isn't the first health problem Haynesworth has faced since leaving the NFL.
Haynesworth told a Nashville radio station in 2016 that he dealt with a brain aneurysm in November 2014 that caused him to spend time in intensive care. Haynesworth referenced that issue in his Instagram post.