The side effects of radiation therapy can vary depending on the treatment area and dose. Common side effects include: - Skin Changes: Redness, peeling, or blistering in the treated area. - Fatigue: A prevalent side effect due to the body's energy being directed towards healing and repair. - Specific Organ Effects: Depending on the treatment site, there can be specific effects such as nausea (if the abdomen is treated) or difficulty swallowing (if the neck is treated).