Older adults who are treated for cancer are at risk of developing disabilities due to the symptoms of cancer and the side effects of treatment. Disability occurs when a person has trouble performing the activities he or she needs to do in everyday life. For example, fatigue and pain can make it difficult for an older adult to do housework, leisure, or volunteer activities. Disability makes it harder for older adults to stay active and be productive members of the community, and it can increase the costs of healthcare.