Doctors, what are the short and long term side effects of radiation?

Radiation toxicities. The short term radiation effects depend on the location of treatment. Most common are diarrhea and skin erythema (pink sunburn type effect). Fatigue is also common. It depends on what organs are hit by the radiation therapy. Late effects are fibrosis (thickening of the tissue) and premature aging of the tissue. Permanent tanning of the skin can also occur. Ask your local radiation oncologist.