Cancer treatments such as chemotherapy, radiation therapy, and biologic therapy can cause fatigue in cancer patients. Fatigue is also a common symptom of some types of cancer. Patients describe fatigue as feeling tired, weak, worn-out, heavy, slow, or that they have no energy or get-up-and-go. Fatigue in cancer patients may be called cancer fatigue, cancer-related fatigue, and cancer treatment-related fatigue.
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