“I slept 12 hours straight, so why do I still feel like my bones are filled with lead, without even the strength to hold a glass of water?” This is the frustration that patients most commonly share with doctors in oncology clinics. When family members see the patient so exhausted, they often say sympathetically: “You’re too weak, hurry back to bed and rest.” But strangely, the more you lie down, far from feeling recharged, the more tired you become, and your mood even sinks into a low.
This isn’t because you “aren’t resting hard enough”—you’re facing a tremendous challenge experienced by over 80% of cancer patients: “Cancer-Related Fatigue (CRF).” Research indicates that the overall prevalence of CRF (including mild cases) is approximately 70%, with some specific cancer types (such as gynecological tumors) having a combined prevalence as high as 80–95%; furthermore, the proportion of patients reporting CRF during chemotherapy and radiotherapy can reach as high as 80–100% [1][2].
Understanding the Invisible Enemy: This Is Not Ordinary “Tiredness”
Ordinary fatigue—like after running a marathon or pulling an all-nighter—can be recovered from with a good night’s sleep. But “cancer-related fatigue” is completely different.
This is a whole-body, persistent, extreme exhaustion caused by cancer itself and its treatments (such as chemotherapy and radiation therapy). Treatment drugs alter the hormones and metabolism in the body, and may even trigger chronic inflammatory responses that affect all body systems through inflammatory cytokines [3]. This fatigue is “systemic”—it not only drains your physical energy but also causes attention to wander and memory to decline (commonly known as “chemo brain”). Research indicates that the prevalence of chemotherapy-related cognitive impairment (CRCI) is approximately 75%, with mechanisms including oxidative stress, neuroinflammation, and impaired blood-brain barrier function [4], severely affecting quality of life.
Debunking the Myth: Is “More Rest” the Wrong Approach?
Traditional thinking always held that being ill means “resting quietly,” but when facing cancer-related fatigue, “absolute bed rest” is actually the worst strategy.
When you lie in bed all day without moving, the body quickly undergoes a chain reaction: muscle mass is lost at an accelerated rate (sarcopenia), cardiopulmonary endurance decreases, blood circulation worsens. Research shows that among cancer patients at risk of sarcopenia, as many as 87% simultaneously experience fatigue symptoms, with a significant positive correlation between muscle function loss and fatigue severity [3]. This physiological deterioration makes you feel even weaker, and weakness makes you even less willing to move, ultimately forming a terrible vicious cycle [3].
The latest international medical guidelines have established: the most effective way to combat cancer-related fatigue is not sleep, but “moderate exercise.” The latest guidelines from NCCN (National Comprehensive Cancer Network) and ASCO-SIO (American Society of Clinical Oncology) both position exercise therapy as the first-choice non-pharmacological intervention for managing CRF; research also shows that pharmacological treatment (such as psychostimulants or antidepressants) has no significant benefit for CRF [5].
Move and Benefit: A Three-Stage Exercise Method Exclusively for Cancer Patients
“I don’t even have the strength to get out of bed—how is it possible for me to exercise?” Don’t worry—the exercise referenced here is not going to the gym to lift weights or run. For cancer patients, the purpose of exercise is to “awaken the nervous system” and “maintain basic muscle strength.”
Combined results from multiple large-scale clinical studies show that aerobic exercise, resistance training, and combined exercise integrating both, all effectively improve fatigue in cancer patients, with combined training showing the most significant effect [6]. By progressively adopting the “three-stage exercise method” based on the current state of your body, you can effectively reduce fatigue:
Low Energy Period (immediately after treatment, extremely weak)
At this point you may feel dizzy even standing up—that’s okay, we’ll do it in bed.
Method: Sit on the edge of the bed or lean against a pillow, and perform slow “diaphragmatic breathing” to increase blood oxygen levels. Then, with feet hanging or flat, perform “ankle circles” and “toe gripping and releasing” movements. This promotes lower limb blood circulation, prevents blood clots, and gently activates muscles.Stable Period (slightly recovered energy, able to move around the room)
The goal at this stage is to maintain cardiopulmonary function and lower limb strength, preventing muscle atrophy.
Method: Perform “slow walking” on flat, safe indoor or park terrain. Only 10 to 15 minutes per day is needed. If you feel tired, walk for 5 minutes, rest a bit, then walk another 5 minutes. The key is “maintaining the habit of daily activity,” not pursuing step counts. International cancer clinical guidelines recommend a reference target of approximately 150 minutes of aerobic activity accumulated per week combined with 2 days of light strength training per week, which can be flexibly adjusted based on individual condition [5].Recovery Period (when a course of treatment is completed or energy is better)
Flexibility and light resistance training can be added to help the body return to normal.
Method: Perform light yoga, stretching exercises, or use extremely light resistance bands for chest expansion exercises with the hands. Clinical research has similarly confirmed that mind-body exercises such as yoga and tai chi are safe and effective ways to relieve fatigue [6]—these not only relieve the tension in joints due to prolonged bed rest but also effectively improve nighttime sleep quality, making “rest” truly effective.
Listen to Your Body—Be Your Own Pacer
Fighting cancer is like a long marathon, and you must be your own best pacer.
Don’t push yourself because you walked a little extra today, and don’t feel discouraged because today you could only do ankle circles in bed. Every deep breath and every small stretch is a powerful signal you’re sending to your body saying “we’re getting better together.”
The first step to overcoming cancer-related fatigue begins tomorrow morning—sit on the edge of the bed and take five deep breaths for yourself!
【Expert Reminder】
Everyone’s cardiopulmonary function and bone condition is different (especially for patients with bone metastasis). Before starting any new exercise plan, be sure to first discuss with your attending physician or cancer rehabilitation doctor to confirm the safety of movements and appropriate intensity.
References
Kang YE, et al. Prevalence of cancer-related fatigue based on severity: a systematic review and meta-analysis. Sci Rep. 2023;13:12815.
Li X, et al. Prevalence and risk factors for CRF in women with malignant gynecological tumors. BMC Cancer. 2025.
Barreto CS, et al. Absence of risk of sarcopenia protects cancer patients from fatigue. Eur J Clin Nutr. 2022;76:206–211. PMID:33986491
Cheng AS, et al. Chemotherapy-related cognitive impairment: What we need to know and what we can do. Asia Pac J Oncol Nurs. 2024. PMC10716696.
Bower JE, Lacchetti C, Alici Y, et al. Management of Fatigue in Adult Survivors of Cancer: ASCO–SIO Guideline Update. J Clin Oncol. 2024. doi:10.1200/JCO.24.00541
Chen X, et al. Effects of exercise interventions on cancer-related fatigue and quality of life among cancer patients: a meta-analysis. BMC Nurs. 2023;22:192. PMC10261838.