The 57-year-old comedian, who became ill during his stand-up show Weapons of Self Destruction earlier this week in Florida, will have to undergo heart surgery.
The star was in the middle of an 80-show tour when he suddenly felt short of breath. Exams at a Miami hospital confirmed that Williams was having heart problems.
‘I’m so touched by everyone’s support and well wishes. This tour has been amazing fun and I can’t wait to get back out on the road after a little tune-up," explained Williams.
Robin Williams earned an Oscar for best supporting actor in 1998 for the film Good Will Hunting.