Fatigue

Woman in pain at her desk

What is fatigue? 

Fatigue means feeling extremely tired most or all of the time. Often it is not relieved by rest.  Fatigue is a very common symptom of cancer and can build up over the course of your treatment. The tiredness usually eases off gradually once you’ve finished treatment.

Some people can still feel tired for a year or more afterwards or find that fatigue develops some time after treatment. 

Tell your doctor or nurse if fatigue is affecting you, so they can find the cause and give you advice and treatment to help.

What are the symptoms?

Fatigue can be mild or more severe. Different people experience fatigue in different ways.   

If you have fatigue you may find:

  • Simple chores such as showering or preparing food seem overwhelming.
  • You feel as if you have no energy and could spend whole days in bed.
  • You have trouble thinking, speaking or making decisions. 
  • You feel breathless after only light activity. 
  • You have trouble getting to sleep (insomnia).
  • You lose your sex drive.
  • You feel sad, frustrated or upset.
  • Your tiredness disrupts your work, social life, or daily routine.    

What causes fatigue?

  • The cancer itself.
  • Cancer drugs like chemotherapy or targeted therapies.
  • Surgery – You may feel very tired when you’re recovering from surgery.
  • Radiotherapy. Fatigue can build up during a course of radiotherapy, so you might find you feel more tired towards the end of your treatment. Travelling to and from the hospital can also add to your tiredness.
  • Not eating well  fatigue can be caused by poor nutrition, Your body needs protein, carbohydrates, fats, vitamins, minerals, and water to do its work. We have a booklet Diet and Cancer, which has tips on eating well during and after cancer treatment.
  • Low levels of red blood cells (due to the cancer or its treatment).
  • Not sleeping well.
  • Dealing with difficult emotions and feeling stressed, anxious or depressed.
  • Lack of exercise physical activity can help build your stamina and reduce your fatigue so you can go about your daily activities.

Fatigue after treatment ends

Some kinds of fatigue can last months or even years after treatment. Fatigue that lasts for more than six months after treatment has ended is known as persistent cancer-related fatigue.

A lot of cancer survivors don’t bother telling their doctors or nurses about their fatigue after treatment because they think that nothing can be done, but there are things that can help.

How is fatigue treated?

Some treatments can help with fatigue, depending on what’s causing it. 

  • Blood transfusion. If you’re fatigued because you have a low red blood cell count (anaemia), having an infusion of blood can make you feel better.
  • Nutritional advice. If you’re not eating well, a dietitian may be able to give you some advice to help you get the nutrients and calories you need from your diet to keep your energy and strength up. They can also give you any supplements you might need. For example, iron or vitamin B12. 
  • Hormone or steroid treatment. Some types of surgery and certain immunotherapy and hormone therapy drugs can affect your hormone levels, which can leave you feeling tired. You may need or hormone supplements or steroids to improve your fatigue. 
  • Counselling. Feeling anxious or depressed can sap your energy. Talking to a counsellor can help you to feel better. Find out more about counselling and how to get free counselling
  • Complementary therapies. Some complementary therapies may help relieve fatigue, depending on what’s causing it. For example, gentle massage, yoga or mindfulness. Check with your medical team first, to make sure the therapy you’re thinking about is safe for you. Read more about complementary therapies.

Exercise and fatigue

Exercise has been proven to be helpful in relieving fatigue. If your illness allows you to do physical exercise, get some on a regular basis. For example, a 30-minute walk 3 days a week might be a realistic goal and will boost your morale when you achieve it. Check with your doctor to see what kind of exercise is best for you.

What should I do if I have fatigue?

  • Exercise: Try to do some exercise – ask your doctor for advice about the best exercise for you.
  • Rest: Build rest periods into your day and save your energy for doing the things that are most important to you. If you are going somewhere special, have a rest before you go out 
  • Get help: Ask for help at work or at home, especially with cooking, housework or childcare.
  • Eat well: Try to eat a well-balanced diet. Eat little and often if your appetite is poor. You could read our booklet Diet and Cancer for tips to help you eat well. 
  • Avoid stress: Talk to friends and family about any worries you have and take time to enjoy yourself. Counselling may help if you’re finding it hard to cope.
  • Relaxation therapies may help, such as visualisation, yoga, meditation and acupuncture. Your local cancer support centre may have sessions where you can learn these techniques. Free guided mediation videos are available online. 
  • Sleep: If you are not sleeping well, try relaxation techniques and avoid stimulants like caffeine and alcohol before bedtime. 
  • Complementary therapies: Try complementary therapies like meditation, acupuncture or massage.
Fatigue diary
Fatigue diary
Keeping a fatigue diary can help you to identify when your energy levels are highest, how you felt at different times and what helped you. This can help you to plan your day better.

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