Former NFL running back Chris Johnson revealed publicly that he has been diagnosed with ALS, sharing his story in a television interview that captured both the shock of his diagnosis and the speed with which the disease has progressed since he learned of it in 2025.
Johnson, 40, used a speech-generating device built from recordings of his own voice to communicate during the interview, a detail that itself illustrated how significantly the disease has already affected him. He explained that his case is classified as sporadic ALS, the form that accounts for the vast majority of diagnoses and occurs without any family history of the disease, which is part of what makes the condition so unsettling for anyone who learns they have it.
A career defined by one of the greatest rushing seasons in NFL history
Johnson played ten seasons in the NFL, beginning with six consecutive 1,000-yard rushing seasons with the Tennessee Titans before injuries disrupted the remainder of his career with stops in New York and Arizona. His signature achievement came in 2009, when he rushed for 2,006 yards and set the league’s single-season record for yards from scrimmage, a performance that earned him recognition as the league’s top offensive player that year and the nickname CJ2K that has followed him since.
The Titans organization issued a statement honoring his place in franchise history, describing his on-field leadership and his impact in the locker room and the Nashville community as permanently woven into the team’s story. The Cardinals, Jets, and the NFL Players Association also offered public messages of support following the announcement.
Understanding the disease and its connection to football
ALS, formally known as amyotrophic lateral sclerosis and commonly referred to as Lou Gehrig’s disease, is a neurodegenerative condition that disrupts the communication between nerve cells and muscles throughout the body. The disease progressively weakens muscle function and can eventually compromise a person’s ability to move, speak, and breathe independently.
Research conducted by Boston University’s CTE Center and released in 2021 found that professional football players are roughly four times more likely to develop and die from ALS compared to the general adult male population. Researchers at the time could not pinpoint the precise mechanism behind that elevated risk but suggested that repetitive head impacts and traumatic brain injuries sustained during football careers could play a contributing role. Johnson has referenced that research himself, expressing hope that the league will increase investment in research and continue strengthening player protections for current and future generations.
He is not the only former Titans player to face this disease. A former teammate who played linebacker for the franchise was diagnosed with ALS at age 30 in 2014 and remains alive more than a decade later, offering some perspective on the unpredictable course the disease can take in different individuals.
A rapid decline and a determination to keep fighting
Johnson described the disease’s progression as far faster than he had anticipated when he was first diagnosed. He recalled being able to lift his seven-year-old daughter just over a year ago so she could make a wish over her birthday cake, a simple moment that is no longer physically possible for him. His wife described her own assumptions when symptoms first appeared, believing the cause might be related to a football injury such as a pinched nerve rather than something as serious as ALS.
Johnson said the initial shock of the diagnosis eventually gave way to a decision about how to respond, and he chose to fight rather than give in to the disease. He is currently participating in a clinical trial as part of his treatment.
Throughout his public statements, Johnson has emphasized that the physical changes ALS has imposed on his body have not altered who he is internally. He continues to think clearly, dream, and love his family the same way he always has, even as his body no longer cooperates with what his mind wants it to do.
