Why did Sridevi faint?

 

Sridevi continued working even when she wasn't ill. There are well recorded features about how Sridevi worked when she had a fever during Mr. India or Chaalbaaz. She fainted during the making of Meri Biwi Ka Jawab Nahin. She had an accident on the sets of a film where she was a guest-star... 

It's not all glamour, fame, power and money - actors really had to slog through.