Jet Li in treatment for hyperactive thyroid

Jet Li says 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.

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

He joked about his weight gain and said "I'm fat, I don't have the time to lose it. It's a fact!"

He explained that exercise is not advised with the medication he's taking. An overactive thyroid, or hyperthyroidism, causes changes in a person's metabolism and heart rate, among other symptoms.

Li catapulted to fame in the '90s with the "Once Upon a Time in China" films.