Fatigue is one of the most common effects of prostate cancer treatment, yet it is often underestimated. It is different from ordinary tiredness: it can last for weeks or months, and rest alone does not always fix it. Poor sleep can add to the problem. Understanding why it happens, and what helps, makes it easier to manage.
Why treatment causes fatigue
Several factors can contribute:
- Surgery: the body uses a lot of energy to heal after an operation. Tiredness for several weeks after a robotic prostatectomy is normal.
- Radiotherapy: fatigue often builds during the course of treatment and can continue for some weeks afterwards.
- Hormone therapy: lower testosterone commonly causes tiredness, loss of muscle and reduced motivation. Our guide to hormone therapy explains this.
- Emotional strain: worry, low mood and the stress of a diagnosis are tiring in themselves.
- Other factors: anaemia, thyroid problems, pain, some medicines and reduced activity can all play a part.
Why sleep can be disrupted
Men may find sleep harder during and after treatment because of:
- getting up at night to pass urine
- hot flushes and night sweats, particularly with hormone therapy
- discomfort after surgery or while a catheter is in place
- anxiety and racing thoughts
- changes to daily routine
Practical ways to improve sleep
Small changes can help:
- go to bed and get up at similar times each day
- keep the bedroom cool, dark and quiet
- reduce caffeine after midday and limit alcohol, which disrupts sleep
- drink less in the two hours before bed, to reduce night-time trips
- avoid screens for an hour before sleep
- keep a notepad by the bed to write down worries
- try relaxation techniques, such as slow breathing
If night-time trips are frequent, our article on nocturia explains possible causes and remedies.
Exercise: the most effective step
It may seem surprising, but regular physical activity is one of the best ways to reduce cancer-related fatigue. Research shows it can improve energy, mood and sleep. It also helps protect muscle and bone strength, particularly during hormone therapy.
Start gently and build up:
- short daily walks at first
- gradually increasing to around 150 minutes of moderate activity a week
- adding strength exercises twice a week when you feel able
Check with your team before starting anything strenuous after surgery. Your surgeon or physiotherapist can advise on timing.
Pacing your energy
Pacing means planning your day to make the most of the energy you have:
- do the most important tasks when you feel best
- break larger jobs into smaller steps
- take short rests before you become exhausted
- accept help with household tasks
- keep a simple diary to spot patterns
Eating well
A balanced diet with regular meals helps keep energy levels steady. Smaller meals more often can be easier to manage than large ones when you feel tired, and simple, ready-prepared options can save energy on difficult days. Drink plenty of water during the day. If your appetite is poor or you are losing weight without trying, mention it to your team.
When to seek advice
Tell your team if fatigue is severe, getting worse or affecting your ability to manage daily life. They may check for treatable causes, such as anaemia or an underactive thyroid. Persistent low mood, loss of interest or feeling hopeless can also cause tiredness and deserve support. Our article on mental health and prostate cancer explains where to find help.
Macmillan Cancer Support has detailed guides on coping with fatigue, and Prostate Cancer UK offers advice specific to prostate cancer treatments.
Professor Prokar Dasgupta and his team support men throughout treatment and recovery at The London Clinic. Please contact the clinic with any questions.