According to PTI sources at AIIMS, she was admitted to the old private ward of Pulmonary Medicine Department around 5 PM.
Doctors at the medical institute termed her condition as stable and said "there was nothing to worry".
"Sushma Swaraj has undergone some test for her chest pain. Reports will come by tomorrow. She is stable now," said Amit Gupta, spokesperson of AIIMS.
Around 10 PM, sixty-four-year-old Swaraj was shifted to the Cardio-Neuro Centre of the hospital.
Swaraj is scheduled to meet Pakistan Foreign Ssecretary Aijaz Ahmed on Tuesday.