Pain is a key symptom at all stages of cancer. It may be the first sign experienced by the patients, it may be a sign of relapse after curative treatment and many patients with metastatic disease may suffer for years due to suboptimal pain treatment. Cancer patients are reporting that pain is the symptom they mostly fear and that they hypothetically may consider to ask for euthanasia in a state of unbearable pain. During the last decade much attention has been given to improve pain treatment in cancer care; however, despite these efforts epidemiological studies are indicating that as many as 50% suffer from untreated pain. These data are in contrast to ‘older’ validation studies which have documented that as many as 90% may achieve acceptable pain control. Several explanations of the gap between best clinical practice and what happens in ‘real life’ have been put forward such as inferior diagnosis (pain classification), inferior follow up (evaluation of the pain treatment), lack of use of multi model treatment strategies and patient’s compliance to strong opioids. One fundament of medical science is to apply the existing knowledge about the use of diagnostic instruments such as biopsy, imaging, clinical examination and patient’s physical performance status in an appropriate and systematic manner. For cancer pain, international consensus does not exist
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