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Cancer-related fatigue is a profound and overwhelming state of exhaustion that is fundamentally distinct from normal tiredness, as it cannot be relieved by a good night’s rest or sleep. This deep fatigue occurs because the body is locked in an intense internal struggle; the immune system expends massive amounts of energy trying to fight the disease, while the tumour simultaneously steals vital nutrients and energy to fuel its own rapid growth. . Furthermore, this depletion is often worsened by tumour-induced anaemia, a condition where the body lacks enough healthy red blood cells to carry sufficient oxygen to tissues, leaving individuals feeling constantly drained and physically weak. In addition to simple weight loss caused by a low appetite, cancer can trigger a much more severe condition known as cachexia, a complex metabolic syndrome driven directly by the disease itself. Rather than just a lack of food intake, cachexia is fuelled by inflammatory cytokines—chemical signals released by both the tumour and the immune system—that radically alter the body’s normal metabolism. These chemicals cause the body to burn calories at an accelerated rate, far faster than they can be replaced. This metabolic disruption leads to an involuntary and severe loss of skeletal muscle mass and fat, a wasting process that is uniquely challenging because it cannot be reversed by increased nutritional intake or traditional feeding alone. Read a transcript
Dealing with Cancer-related fatigue
Cancer-related fatigue (CRF) is a persistent, overwhelming sense of tiredness and exhaustion that occurs during or after cancer treatment. Unlike normal tiredness, it can build up over time, interferes with daily activities, and cannot be relieved by rest.
While it is usually temporary and gradually improves after treatment ends, some individuals may experience long-term fatigue. Its varied symptoms include poor concentration, memory lapses, sleep disturbances, muscle pains, breathlessness after light activity, a loss of interest in regular activities, and feelings of anxiety or low mood.
Managing CRF involves several strategies, beginning with informing a medical team so they can investigate potential causes, rule out unrelated conditions, and adjust any medications or supplements to ease side effects. Additionally, individuals can reduce the impact of fatigue by balancing gentle, tailored exercise with periods of rest to boost energy, mood, and sleep. Maintaining a well-balanced diet and staying hydrated are also crucial for sustaining energy levels. Finally, practicing relaxation techniques and breathing exercises can help alleviate stress, while developing structured sleep strategies can further improve rest and overall well-being.
Sometimes it’s more than fatigue
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When we talk about cancer, we often focus on the tumour. But for some, there’s an invisible struggle called cachexia—or ‘wasting syndrome.’ It’s more than just weight loss. It’s a complex metabolic condition where the body actively breaks down its own muscle and fat to fuel the tumour. This is driven by a ‘metabolic hijack.’ The tumour releases inflammatory signals that trick the body into burning energy faster than it can be replaced. Recent studies have identified a protein called GDF-15 as a key driver, sending signals to the brain that shut down appetite completely. Cachexia doesn’t just cause weakness; it makes it harder for the body to tolerate chemotherapy, impacting the effectiveness of overall cancer treatment. resistance exercise, and emerging therapies like monoclonal antibodies. If someone you know is experiencing unintended weight loss during cancer care, get them to talk to their medical team early. Knowledge is the first step to better management.Read a transcript
