Fatigue is a common side-effect of cancer, which can last months or even years in some cases. However new research indicates that sufferers may find some relief if they undertake aerobic exercise.

According to UK scientists, fatigue is a serious issue because some people who suffer badly with it become less motivated to continue with their treatment. In the past, those affected were often advised to rest. However, now it is widely acknowledged that long periods of rest can lead to increased tiredness and muscle wasting.

The scientists carried out an extensive review of almost 60 studies, involving more than 4,000 people with cancer.

The study found that aerobic exercise , 'both during and after cancer treatment, can be beneficial'.

"The evidence suggests that exercise may help reduce cancer-related fatigue and should therefore be considered as one component of a strategy for managing fatigue that may include a range of other interventions and education," explained lead scientist, Fiona Cramp, of the University of the West of England.

The team called for more research to assess how often a person should exercise and for how long. More research to determine the effects of exercise on different types of cancer is also required.

"Twenty-eight of the studies we included were carried out in breast cancer patients, so we need to know more about how exercise can help people with a broad range of diagnoses, including patients with advanced disease," Ms Cramp explained.

Details of these findings are published in The Cochrane Library.