RESUMO
<b>Purpose</b>: The present study aims to evaluate the effect of analgesics in cancer patients based on their pain descriptions. <b>Methods</b>: The relationship between the words that patients used to describe their pain due to cancer and the efficacy of treatment with analgesics such as non-steroidal anti-inflammatory drugs (NSAIDs) or opioids was evaluated. <b>Results</b>: We recorded 529words that were used by 164patients to describe their pain and pain quality and classified them into 108types of pain.For patients who used the actual word 'dull' or one with a similar meaning, treatment with opioids was effective. However, treatment with opioids was less effective in patients who used words such as "numb" and "tingling". <b>Conclusion</b>: We were able to gain a good understanding of cancer pain by listening to the actual words that patients used when complaining of pain. These findings suggested that we could choose a suitable medication through evaluation of the actual words cancer patients used to describe their pain and successfully relieve their pain. Palliat Care Res 2009: 4(1): 207-213