


See Fatigue and Cancer Treatment to learn more. People feel fatigue in different ways and you may feel more or less fatigue than someone else who is getting the same amount of radiation therapy to the same part of the body. It can happen all at once or come on slowly. Fatigue is feeling exhausted and worn out. Many people who get radiation therapy have fatigue. Damage to healthy cells can cause side effects. Radiation not only kills or slows the growth of cancer cells, it can also affect nearby healthy cells.
