"I was exhausted and everything felt off. [My professional dance partner] Gleb [Savchenko] and I were rehearsing our cha cha and suddenly I just blacked out," Vanderpump, 52, blogged on People.com about falling ill late last week.
"I was in shock when I woke up. I fainted only once before in my life. The doctor found that I had a viral infection with fever and swollen glands. And between trying to fight that and all of the stress on my body from running around, I ended up with low blood pressure and a rapid heart rate, which is why I fainted," she wrote. "I am still fighting the bug and feeling under the weather but I am staying in the game as long as they say I can. And I will give it my best."