The comments are in response to international criticism the government faced over new law blocking medical referrals made by overseas doctors.
Amnesty International called the law a "dangerous and callous act".
Nauru's Health Minister, Charmaine Scotty, said the attacks were unfounded because the country's medical staff were well-equipped to handle referrals.
Ms Scotty also said there were "many false medical reports" and other attempts by refugees in Nauru to "work the system" in order to reach Australia.
