The most common side effects include fatigue and skin irritation, including redness, dryness, tanning, and itchiness. Skin breakdown, burn and ulcer formation are serious but rare during lung cancer treatment. You may lose hair on your chest, but not the hair on your head. (However, it is worth mentioning that certain types of chemotherapy that may be given together with radiation may cause hair loss on your head as well.) You may experience shortness of breath, a dry cough, difficulty or pain swallowing, or narrowing of the esophagus. See Possible Side Effects for more information. You should also talk to your radiation oncologist about what side effects you might experience during and after treatment.