 Jet Li Before and After Cygnus A viral photo of a now unrecognizable Jet Li has fans fearing for his health as one of the most recognizable faces in the world, Jet Li's adoring fan base stretches far and wide. However, they were united in panic this week when the martial artist was snapped looking a little worse for wear. Photos have surfaced online in the last few days of the 55-year-old Li, who was once famous for his youthful good looks, which have had people questioning what exactly has happened to the beloved actor. Why are Jet Li fans so concerned? In the picture, Jet Li is on the right-hand side. Now suffering from hyperthyroidism, Li looks a world apart from the man we've all grown familiar with. Li's manager, Steve Kazman, spoke to The Washington Post about his client's condition. He explained that this is nothing new for the expendable star, who has been battling it for the last decade, he has hyperthyroidism that he's been dealing with for almost 10 years. It's nothing life-threatening and he's dealing with it. What is hyperthyroidism? The thyroid regulates weight in the body. Li's is currently overactive, which is causing him to lose weight involuntarily. This also leads to lethargy and exhaustion. A diagnosis of the condition isn't fatal, but it's certainly life-changing.