Varies: Can have redness and irritation after 3-4 weeks or may not have problems till completed. Most serious problems can show up months or years after finishing: lung scarring (pulmonary fibrosis), inflammation in the lining of the heart (pericarditis), accelerated cardiac vessel disease, increased risk of heart attacks.
Answered 4/15/2015
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2-3 weeks: The common side effects of breast radiation including skin burning and redness take 2-3 weeks after starting to occur.
Answered 7/9/2013
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