The ABC News morning show host said she felt ill last week while on vacation and was told to return to New York and go to the hospital.
She's home now, and posted on Facebook on Thursday that she's feeling much better.
Roberts underwent a bone marrow transplant in September to treat MDS, a blood and bone marrow disease.
She was off work for five months before returning to the top-rated network morning show on a part-time basis in February.
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."
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