Congress President Sonia Gandhi admitted to Ganga Ram Hospital in Delhi
The 70-year-old has been kept under a strict observation, said doctors.
Dr DS Rana, a top official at Sir Ganga Ram Hospital said, "Mrs Sonia Gandhi was brought to the hospital today evening at 5 pm. She has been found to be suffering from upset stomach."
Sonia Gandhi was rushed to Delhi from Shimla where she on a holiday.
She has been listed as the star campaigner for her party in Himachal Pradesh, one of the few states where Congress has some hold.
Himachal Pradesh is all set for Assembly Elections scheduled on November 9; results for the same will be announced on December 18.