The ABC News morning show host said she felt ill last week while on vacation. She was told to return to New York and go to the hospital. She is back home and feeling much better, according to a post on her Facebook page.
Roberts underwent a bone marrow transplant last year to treat MDS, a blood and bone marrow disease. She was off work for five months before coming back to the show on a part-time basis in February.
For the most part, she worked three days a week - sometimes four. At the beginning of her return, ABC kept a potential fill-in on call at the studio in case she was feeling too ill to continue, the network said.
In a Facebook post, Roberts said doctors told her that her setback did not occur because she was working or doing too much.
"It's extremely common, post-bone marrow transplant, to have complications," she wrote. "I'm blessed that mine have not been severe."
She said she planned to return to the show next week.
The Associated Press contributed to this report.