The singer suffers from a form of facial paralysis.
Justin Bieber has revealed why he's had to cancel some of his shows this week.
The 28-year-old spoke to fans in an Instagram video about a medical condition he's dealing with.
Bieber has been diagnosed with Ramsay Hunt syndrome recently.
The disease arises from an outbreak of shingles and affects the facial nerves near someone's ears.
Bieber was struggling to move his eyes and smile on one side of his face in the video.
It's given fans an answer as to why he cancelled three shows of his Justice World Tour.
The singer asked for fans to be patient given the news.
Bieber spoke to the 240 million followers he's amassed on his Instagram page.