AIIMS hospital sources said Gandhi complained of exhaustion and mild chest pain and was taken to the Intensive Care Unit as a precautionary measure before she was shifted to the Cardio-Neuro Centre.

The sources said she underwent some tests including an ECG and was under observation at AIIMS where top doctors including its director Deka attended on her. Balram Airon, Head of Cardio-Thoracic Surgery Department, was monitoring Gandhi's health condition.

The Congress chief was stated to be suffering from viral fever since Sunday and was suddenly taken ill after spearheading UPA's ambitious Food Security Bill in Lok Sabha yesterday.

She was seen leaving Parliament last night holding the hand of Union Minister Selja before boarding a vehicle. Her son and Congress Vice President Rahul Gandhi also accompanied her.

"She was very concerned about the food bill and she was regretting that she could not be present in Parliament (when the voting was on). Then we told her the bill has been passed. She expressed happiness over it. "Everything is normal with her. There is nothing to worry. She is completely fine. All the tests have been conducted," Selja said.