What kinds of bad side effects can be from cancer radiation?

Side effects : General side effects of radiation therapy include diarrhea, nausea, vomiting. There can also be radiation dermatitis where the radiation has been exposed to the skin.

Depends: Will try to be general as body location, type of radiation, reason for treatment, etc play a sig role in answering your q. Short term: inflammation with resultant symptoms based upon organs/tissues treated or receiving dose, fatigue, etc long term: scar tissue, cancer risk, etc as one faces most treatments: try to eat small freq meals, stay hydrated, exercise.