Nausea and even vomiting is indeed one of the common side effects of radiation aside from the pain. The incidence of this symptoms is highest among those who are receiving radiation to their abdominal area. For breast radiation, it is possible that some radiation can find its way through the tissues and affect part of the esophagus. this in turn can affect sphicter functions and may manifest as nausea or frank vomiting.
Though common, there are drugs that can be employed to counteract this and you can ask your doctor about these. Practical measures would include nibbling on ice to lessen the nausea symptoms.
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