Judge Stephen Robinson did not describe the symptoms Friday. But he says the Westchester County jail's psychiatric director told him about words or actions "that raised the level of concern."
Robinson raised the possibility that Kerik would have to waive doctor-patient privilege or even undergo a court-ordered examination.
Defense lawyer Barry Berke says Kerik is not taking medication but is "regularly speaking to staffers."
Kerik has pleaded not guilty to accepting co-op renovations in exchange for recommending a company that sought city business.
Kerik won glowing reviews for his leadership after 9/11. He withdrew his nomination to lead the federal Homeland Security agency as corruption allegations mounted.
Earlier this month, Robinsonfor Kerik and sent him to jail to await his corruption trial.
Calling Kerik "a toxic combination of self-minded focus and arrogance," Judge Stephen Robinson said he was revoking the $500,000 bail because Kerik disclosed sealed case information to the trustee of his legal defense fund.