Mrs. Buhari also stated that the President has resumed work as he met with the Attorney-General of the Federation, Abubakar Malami on Tuesday evening.
The President's rare public appearances lately has fuelled speculations that all is not well with his health.
Buhari had returned from the United Kingdom on March 10 after an extended medical vacation, but he only appeared publicly a few time since then.
According to Mrs. Buhari, her husband's health is not as bad as it is being speculated.
The First Lady revealed this on Tuesday, May 2, in a series of tweets.
"I wish to inform everyone that his health is not as bad as it’s being perceived, Meanwhile he continues to carry out his responsibilities," she tweeted via her handle - @aishambuhari.
Mrs. Buhari also stated that the President on Tuesday evening met with Abubakar Malami, Attorney-General of the Federation, and Maikanti Baru, Group Managing Director of the Nigeria National Petroleum Corporation (NNPC).