US Republican presidential candidate Donald Trump has pledged to release details about his health after his Democratic rival Hillary Clinton was diagnosed with pneumonia.
Mr Trump said health had now become "an issue" in the election campaign.
Mrs Clinton was taken ill on Sunday at a 9/11 memorial ceremony and cancelled a campaign trip to California.
She will also be releasing new medical records to help ease concerns about her health, a campaign spokesman said.
"There's no other undisclosed condition. The pneumonia is the extent of it," Brian Fallon told MSNBC.
He said she would probably resume campaigning in the next few days.
The incident capped off a difficult weekend for Mrs Clinton, who came under attack from Mr Trump for calling half of his supporters "deplorable" people on Friday.
Mr Trump wished her a speedy recovery and said he would release the results of a medical examination he took over the past week, with "very, very specific numbers"
"Hopefully they're going to be good. I think they're going to be good. I feel great," he told Fox News.
So far Mr Trump has only released a note, in which his doctor declared that he would be "the healthiest individual ever elected to the presidency".
Mr Trump, 70, and Mrs Clinton, 68, are among the oldest US presidential candidates in history.
On Sunday, video showed Mrs Clinton being supported by aides as she entered a van to leave the 9/11 ceremony after an hour and 30 minutes.
Her campaign initially said she had been taken to her daughter's New York flat after feeling "overheated".
She re-emerged later on Sunday, telling reporters: "I'm feeling great. It's a beautiful day in New York."
Doctors subsequently confirmed she had been diagnosed with pneumonia on Friday.
Some critics questioned why this had only been revealed after Sunday's events.
Mrs Clinton's communications director has admitted the campaign "could have done better" managing Sunday's incident.
The candidate had been due to leave for California on Monday morning for a two-day trip that included fundraisers, a speech on the economy, and an appearance on the Ellen DeGeneres Show.
She is now resting at home in Chappaqua, New York.
Mrs Clinton suffered a coughing fit last week at a campaign event in Cleveland, Ohio, which fuelled speculation about her condition.
Last month, Dr Bardack said in a letter that the candidate was "in excellent health and fit to serve as president of the United States". She had made a full recovery from surgery she underwent in 2012 for a blood clot, the doctor added.
But Mr Trump has repeatedly suggested she is unfit, telling supporters last month she "lacks the mental and physical stamina" to serve as president.
"I don't know what's going on. I'm like you, I see what I see," he said after Mrs Clinton's pneumonia diagnosis was confirmed.
The Clinton campaign has accused opponents of pushing a "deranged conspiracy" about her health.