"The Chief Minister suddenly did not feel well due to humidity. Now he is completely OK and at Naveen Nivas (his residence)," an official of the Chief Minister's office said.
He would also attend all his programmes scheduled for the day as he is completely alright, the official said.
The chief minister, who unfurled the national tri-colour at the state-level parade at Mahatma Gandhi Marg, was visibly unwell while delivering his address and was seen slowing down towards the end of his speech.
On way to his residence, the chief minister went to the Capital Hospital where doctors examined him and said his health condition is perfectly alright.
Senior BJD leader Debi Prasad Mishra told reporters after meeting Mr Patnaik at his residence that the chief minister is fit and there is nothing to worry about his health.