CHAPEL HILL, N.C. (CNN) -- Democratic presidential candidate John Edwards and his wife, Elizabeth, will hold a news conference Thursday to discuss what sources close to Edwards described as possible developments with her health.

The sources would not disclose the exact nature of Thursday's announcement, but they did say that the couple is not going before the press to say that "everything is OK."

Elizabeth Edwards underwent treatment for breast cancer after the 2004 campaign, in which her husband was the Democratic vice presidential nominee.

The sources close to Edwards said his wife had a routine follow-up appointment on Monday to check her breast cancer, which was believed to be in remission. According to sources, the doctor called back on Tuesday and asked her to come in again on Wednesday.

Edwards, who was campaigning in Iowa, cut short the rest of his schedule on Tuesday to fly back to be with her. The two of them went to see the doctor together on Wednesday, the sources said.

A blog posting on Edwards presidential campaign Web site Wednesday evening was entitled, "We love you, Elizabeth."

Jennifer Palmieri, an Edwards spokeswoman, declined comment when contacted by CNN. It remained unclear whether the developments would have any effect on his presidential campaign.

The news conference will be held at noon in the Carolina Inn in Chapel Hill, N.C.