Chennai, May 3 : Tamil Nadu Chief Minister M. Karunanidhi was admitted to the Apollo hospital on Sunday morning following complaints of high fever.

According to doctors, the 85-year old Dravida Munnettra Kazhagam (DMK) chief is undergoing treatment.

Karunanidhi also complained of severe back pain, sources said.

Karunanidhi had undergone a major surgery on his back in February. (ANI)