The 42-year-old reportedly fell unconscious, leading to her hospitalisation at Jaslok Hospital.
Recently, the actress, who was in Kathmandu redoing her house, had also suffered a bout of food poisoning.
According to reports, she was unwell for the last few days and had mentioned it on a social networking platform. After this she fell unconscious and was immediately flown to Mumbai with her mother for further check-ups.
When asked about her diagnosis, a reliable source confirmed the news saying, `Manisha has been diagnosed with ovarian cancer and is undergoing treatment at Jaslok Hospital. Her family is by her side.`
Commenting on Manisha's condition, Krishnakant Dasyam, Jaslok Hospital PRO, said, `All these reports are merely speculation. Her check-up is still not complete and her tests are being carried out. She is fine and is undergoing treatment. There has been no diagnosis as such.`
On being asked what tests had been carried out, he said, `We can't reveal what tests are being conducted as the patient has requested us to maintain confidentiality.`
Manisha made her debut in 1991 in Saudagar and recently made her comeback in Ram Gopal Varma's Bhoot Returns.
