Question: what are the side effects of radiation therapy for breast cancer?
Answer: Pain and skin changes. During and just after treatment, your treated breast may be sore. ... 
Fatigue. Fatigue is common during radiation therapy and may last for several weeks after treatment ends. ... 
Breast and skin changes. ... 
Lymphedema. ... 
Nausea and hair loss. ... 
Rib fracture. ... 
Heart problems. ... 
Lung problems.