The columnist Robert Novak has a brain tumor and will stop writing and making television appearances, at least temporarily.

“On Sunday, July 27, I was diagnosed with a brain tumor,” Mr. Novak said in a statement on Monday. “I have been admitted to Brigham and Women’s Hospital in Boston, where doctors will soon begin appropriate treatment. I will be suspending my journalistic work for an indefinite but, God willing, not too lengthy period.”

His office in Washington declined to give more information, but referred a reporter to statements made by his assistant, Kathleen Connolly, to The Chicago Sun-Times, the home newspaper of his column.

Image Robert Novak Credit... Pablo Martinez Monsivais/Associated Press

In an article on that newspaper’s Web site, Ms. Connolly said that Mr. Novak and his wife, Geraldine, flew to Massachusetts on Saturday to visit their daughter, near Cape Cod. On Sunday, she said, he was taken ill, but she did not elaborate. He was taken by ambulance to the hospital, and admitted to the intensive care ward.