She is considered one of the greatest playback singers in Indian cinema and received the Bharat Ratna, India's highest civilian honour, in 2001.
The 90-year-old Mangeshkar was admitted to the Breach Candy Hospital in the early hours of Monday where Dr Patit Samdhani is treating her.
Mangeshkar's younger sister Usha said the singer had a viral infection and should be discharged by Tuesday
PM Narendra Modi also sought Mangeshkar's blessings
Mangeshkar was recognised as a veteran singer who has produced many memorable hits in Hindi movies