On Tuesday, Health Minister Ghulam Nabi Azad told IANS: "She is doing fine and is resting."
Prior to the AIIMS statement, there was some confusion about the nature of her ailment.
While Azad and party leader Janardan Dwivedi said Gandhi was suffering from "common cold and headache" and had taken some medicines that did not suit her, Das said "she had minor viral fever and a headache".
"When I walked up to her in the house, from her facial expressions I felt she was not well," recounted Das.
Another Congress leader, who did not wish to be identified by name, however, said Gandhi complained of chest pain -- before the Lok Sabha took for voting numerous amendments to the bill.
Some MPs had noted a slight shivering of hands as Gandhi read her speech in the Lok Sabha Monday.
