What is happening to Jet li?

Jet li

Jet Li has revealed that he's being treated for an overactive thyroid, but he's determined to fight the condition head-on.
The Chinese action star, known for his kung fu skills, discussed his diagnosis during the taping of a talent show he's judging in China. 

Jet in his slimmer days

In Tuesday's taping, the 50-year-old Li appeared to have a fuller face and heavier frame.