RJD Chief, Lalu Prasad Yadav admitted to Asian Heart hospital in Mumbai pic.twitter.com/6EdHEDbxQo — ANI (@ANI_news) August 25, 2014

It is speculated that he may need to under a heart operation.

A decision on the need for an operation, if at all, will be taken later in the day, sources said.

MUMBAI: Former Bihar chief minister Lalu Prasad is undergoing a detailed health evaluation at Asian Heart Institute in Bandra Kurla Complex, said a statement issued by the hospital a few minutes before noon on Monday.The Bihar leader, who was formerly the Union railway minister, had planned the visit and was flown into the city late on Sunday."This is a planned visit," said the hospital statement, ending speculation that he was rushed to Mumbai for a heart-related emergency.He is under the care of senior heart surgeon Dr Ramakanta Panda, who had operated on former Prime Minister Manmohan Singh.The news comes on a crucial day as the bypolls votes for 10 seats in Bihar are also counted on Monday. Yadav had tied up with Nitish Kumar’s Janata Dal United for the Bihar byelections.