Robin Roberts takes few weeks from 'Good Morning America'

NEW YORK Roberts announced Tuesday that she is going to "just get some vacay" because she's "not feeling too well."

Roberts is taking her time off earlier than her planned medical leave for a bone marrow transplant. She had said previously that her medical leave would likely start at the end of August or early September.

The 51-year-old announced in June that she has myelodysplastic syndrome. MDS is a blood and bone marrow disease linked to the cancer treatment that once saved her life.

About 18,000 cases are diagnosed each year, and only a few hundred are caused by chemotherapy or radiation. Sometimes, cancer treatment can affect the DNA of blood-producing stem cells. Later, the fear is that it can turn into leukemia.

ABC News contributed to this report.

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