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CANCER INFORMATION HUB

Cancer-Related Fatigue

​Cancer-related fatigue is one of the most common and often most challenging symptoms experienced during and after cancer treatment. Unlike ordinary tiredness, it may not improve with rest and can affect physical activity, concentration, emotional wellbeing and quality of life. Understanding why fatigue occurs is often the first step towards managing its impact and supporting recovery.

What Is Cancer-Related Fatigue?

Most people feel tired from time to time. Cancer-related fatigue is different.

It is a persistent feeling of physical, mental or emotional exhaustion that may not be proportional to activity levels and may not improve fully with sleep or rest.

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Many people describe it as:

  • Feeling drained or depleted

  • Having little physical energy

  • Difficulty concentrating

  • Feeling mentally "slowed down"

  • Struggling with everyday tasks

  • Needing longer periods of rest

 

Cancer-related fatigue can occur before treatment begins, during treatment or months after treatment has ended.

For some individuals, it becomes one of the most significant factors affecting quality of life.

How Common Is Cancer-Related Fatigue?

Fatigue is one of the most frequently reported symptoms among people living with cancer.

Research suggests that a majority of patients experience fatigue at some stage during their cancer journey.

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It can occur:

  • During chemotherapy

  • During radiotherapy

  • During immunotherapy

  • During hormonal therapy

  • Following surgery

  • During recovery and survivorship

 

The severity varies considerably from person to person.

Why Does Cancer-Related Fatigue Occur?

Cancer-related fatigue rarely has a single cause.Instead, it is often the result of several contributing factors acting together.

The Cancer Itself

 

Cancer can place significant demands on the body.

Inflammation, changes in metabolism and the body's response to illness may all contribute to fatigue.

Reduced Physical Activity

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Periods of illness and treatment often lead to reduced activity levels.

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Over time this can result in:

  • Loss of strength

  • Reduced endurance

  • Physical deconditioning

which may further contribute to fatigue.

Emotional and Psychological Factors

 

Living with cancer can be emotionally demanding.

Stress, uncertainty, anxiety and low mood may all contribute to feelings of exhaustion.

Cancer Treatments

 

Many treatments affect healthy tissues as well as cancer cells.

Chemotherapy, radiotherapy, immunotherapy and hormonal therapies can all increase energy demands while reducing the body's ability to recover.

Sleep Disturbances

 

Many patients experience:

  • Difficulty falling asleep

  • Interrupted sleep

  • Changes in sleep quality

Poor sleep can significantly worsen fatigue.

Other Medical Factors

 

Fatigue may also be influenced by:

  • Anaemia

  • Nutritional difficulties

  • Pain

  • Medications

  • Hormonal changes

  • Infection

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Because fatigue has many potential causes, it is important to discuss persistent symptoms with your healthcare team.

Why People Experience Different Side Effects

Even when receiving the same treatment, two people may have very different experiences.

Many factors influence how someone responds, including:

  • Age

  • General health

  • Nutrition

  • Physical fitness

  • Previous treatments

  • Other medical conditions

  • Individual biological differences

This is why comparing your experience with someone else's is rarely helpful.

Your treatment journey is unique, and symptoms should always be discussed in the context of your own health, circumstances and treatment plan.

What Does Cancer-Related Fatigue Feel Like?

People experience fatigue differently.

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Common descriptions include:

  • "I feel exhausted all the time."

  • "Everything takes more effort."

  • "I wake up tired."

  • "I struggle to concentrate."

  • "Simple activities leave me exhausted."

 

Fatigue can affect:

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Physical Function

 

  • Walking

  • Exercise

  • Household tasks

  • Work activities

Cognitive Function

 

  • Memory

  • Concentration

  • Decision-making

  • Mental clarity

Emotional Wellbeing

 

  • Motivation

  • Confidence

  • Mood

  • Social engagement

Can Fatigue Continue After Treatment?

Yes.

Many people expect fatigue to disappear once treatment ends.

In reality, recovery can take time.

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Some individuals continue to experience:

  • Reduced stamina

  • Physical weakness

  • Cognitive fatigue

  • Slower recovery after activity for weeks or months after treatment has finished.

 

This does not necessarily indicate that treatment has been unsuccessful or that cancer has returned.

Recovery is often gradual and varies between individuals.

Managing Cancer-Related Fatigue

Although fatigue can be challenging, there are often practical strategies that may help reduce its impact.

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Management may include:

  • Maintaining appropriate physical activity

  • Pacing activities

  • Improving sleep habits

  • Addressing nutritional concerns

  • Managing pain effectively

  • Identifying contributing medical factors

  • Supportive care and rehabilitation approaches

 

The most appropriate approach will depend on the individual's circumstances and underlying causes of fatigue.

When Should You Seek Additional Support?

Fatigue should not simply be accepted as something that must be endured.

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If fatigue is affecting:

  • Daily activities

  • Mobility

  • Work

  • Sleep

  • Exercise

  • Concentration

  • Quality of life

it is worth discussing with your healthcare team.

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Many people benefit from additional support aimed at helping them maintain function, improve confidence and navigate recovery more effectively.

Living Well With Fatigue

While fatigue can be frustrating and sometimes overwhelming, many people find that symptoms gradually improve over time.

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Understanding your limits, pacing activities appropriately and seeking support when needed can help reduce the impact of fatigue and improve overall wellbeing throughout treatment and recovery.

Looking for Personalised Support?

Cancer-related fatigue can affect every aspect of daily life, from physical activity and work to concentration, confidence and emotional wellbeing.

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At Rowan Health, we provide personalised supportive care designed to help people maintain function, resilience and quality of life throughout treatment, recovery and survivorship. Our approach focuses on understanding the factors contributing to fatigue and supporting individuals as they rebuild strength, confidence and wellbeing.

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Learn how our personalised supportive care programmes help patients navigate treatment, recovery and life beyond cancer:

About this information

This article has been prepared by Julien Baron-Meyet, Consultant in Integrative & Supportive Care, with over 20 years' clinical experience supporting people living with cancer and complex health conditions.

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The information on this page is intended for education and should complement—not replace—the advice of your healthcare team.

READY TO TALK ?

Take the first step

If you would like to discuss supportive care during treatment or recovery, Rowan Health offers personalised consultations designed around your diagnosis, treatment pathway, symptoms and recovery goals.

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