The 93-year-old leader has been ailing since last year and was being treated at his Gopalapuram residence in Chennai.
The former chief minister "has been admitted for a minor procedure - change of (Percutaneous endoscopic gastronomy) PEG tube. He will be discharged from the hospital later today," Kauvery Hospital Executive Director S Aravindan said in a statement.
Though active for his age, the veteran DMK leader is not seen regularly in public and has been reacting to key issues and developments through his statements.
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