Hospital sources, however, said, "he was fine and it was just a routine check-up."
64-year-old Thakur did not attend court today.
"The CJI visited the hospital earlier in the day. He has been coming to Fortis Escorts Heart Institute for medical check-ups for the past couple of years, and today's visit was also a regular visit. He is doing fine and has returned home. There is nothing to worry about," a source said.
Thakur is the 43rd Chief Justice of India and due to to retire on January 4 next year.
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Thakur was appointed as a permanent judge in September, 1995 and transferred as a judge of the High Court of Delhi in July 2004.
He was appointed as the Acting Chief Justice of Delhi High Court in 2008 and took over as Chief Justice of the High Court of Punjab and Haryana on August 11, 2008.
Taking potshots at the protracted procedures, the Chief
Khehar said the matter goes from one department to another, and then after layers of consideration and reconsideration, a decision is taken that an appeal needs to be filed.
Responding to Union Law Minister Ravi Shankar Prasad and Finance Minister Arun Jaitley's observation, Justice Khehar sought to bring out the difference of opinion in their views about the judiciary.
"There is a difference of perception between the Union Law Minister and Union Finance Minister. I don't blame either. The reason is that I do not know what to say -- are you on the wrong side? or are we on the wrong side?
Earlier, Prasad had said that all the institutions of democracy -- Executive, Legislative and Judiciary -- should function within their limits.
"While upholding the majesty of our courts and independence of judiciary as integral to India's governance, which cannot be tinkered by any which ways, we also need to acknowledge that legislation must be left to those who are elected by the people to make such legislations and governance must be left to those elected to govern by the people of India," the Law Minister said.
"It is the job of the executive to formulate and execute, the job of the legislator to legislate and the duty of the judiciary to interpret so that it becomes sacrosanct. How they have to work in symphony and harmony, is the job that the judiciary needs to find. That's how I think that our Constitutional governance must function," Prasad said.