According to sources, Shiv Sena executive President Uddhav Thackeray, who recently has returned from a foreign trip, complained about health problem.
Citing his deteriorating health condition, Mr Thackeray has been rushed to the hospital. However, Shiv Sena officials claimed that Mr Thackeray has been admitted to the hospital for a routine check up.
Hospital officials have been quoted as saying, "He is undergoing some medical tests, but we are not sure what exactly is the problem. He may be discharged in a day or so."
Other sources said that doctors will declare his present health status only after issuing a medical bulletin by Monday evening.
Meanwhile, his estranged cousin brother Raj Thackeray visited the hospital and met Uddhav Thackeray. Raj's visit to the hospital shocked many as the two brothers don't see eye to eye ever since Raj left the Shiv Sena and started his own party - Maharashtra Navnirman Sena (MNS).
According to sources, Raj was heading towards Alibaug to attend a party function but returned back to Mumbai only to see Uddhav.
Mr Uddhav will turn 52 later in Jul 2012 and he has been handling the Shiv Sena party affairs since 2004.