Congress President Sonia Gandhi, who was on a visit to Shimla, was rushed back to the national capital on Friday and admitted to the Sir Ganga Ram Hospital after she complained of ailment due to stomach upset. <br/><br/>The hospital authorities said that Mrs Gandhi is under observation.<br/><br/>According to sources, Gandhi was rushed to the hospital in an air-ambulance from Shimla, where she had gone for a vacation. <br/><br/>A team of doctors from the hospital was deputed to bring her back from Shimla. Party sources said her condition is stable.