Michael (PJ Stratton/Wenn.com)

Medical leave.

Updated November 10:

Jeanne Cooper will first be seen back in Genoa City as Katherine on December 23.

Updated November 9:

Jeanne Cooper will be heading back to "Y&R" to begin taping scenes next week. She posted on her fan club's Facebook page, "Hello there, I am back. As most of you know I have been under the weather for quite some time now. But the good news is that I will be going back to work next week. Boy I did get hit hard with a nasty bug! Thank you all for your well wishes. They mean so very much to me."

Updated October 25:

A spokesperson at "Y&R" assured Soaps.com that although Jeanne Cooper had to take time off for medical reasons, she is fine now, and expected to return to taping as Katherine Chancellor in November. Head Writer/Executive Producer Maria Arena Bell stated, "Michael Learned is an accomplished actress and we are grateful that she is able to fill in for Jeanne Cooper for this short time. Jeanne is an integral part of our show and we look forward to her imminent return. We have great storyline coming up for Mrs. Chancellor."

Original article October 24:

According to Entertainment Weekly, actress Jeanne Cooper is taking a short medical leave of absence from "The Young and the Restless," and Emmy Award winning actress, Michael Learned, will be filling in temporarily in the role of Katherine Chancellor. Michael, who will be seen onscreen beginning November 10, has done previous Daytime stints on "General Hospital," "All My Children," and "One Life To Live." She is best known for her role as Olivia Walton on "The Waltons," and has also appeared on many television series, including "Gunsmoke," "Who's The Boss," and "Law & Order: Special Victims Unit."

Read about a new contract role on "Y&R" through The Young And The Restless Hires All My Children’s Melissa Claire Egan. Join us on Twitter @soapoperafan and Facebook. Come tweet and Facebook with us about "The Young and the Restless," all the other soap operas, "Dirty Soap," "Glee" "Grey's Anatomy," "Vampire Diaries," and "Venice the Series!"

- Candace Young