Context: Pain is a distressing feeling often caused by intense or damaging stimuli, such as stubbing a toe, burning a finger, putting alcohol on a cut, and bumping the "funny bone". Because it is a complex, subjective phenomenon, defining pain has been a challenge. The International Association for the Study of Pain's widely used definition states: "Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage." In medical diagnosis, pain is a symptom.

Question: What type of stimuli causes pain?
Answer: intense or damaging

Question: What type of feeling is pain?
Answer: distressing

Question: Why has defining pain been a challenge?
Answer: complex, subjective phenomenon

Question: What organization's definition is widely used?
Answer: The International Association for the Study of Pain

Question: In medical diagnosis, what is pain considered?
Answer: a symptom

Question: What definition does the International Association for the Pain Study use for pain?
Answer: Unanswerable

Question: What is pain in complex diagnosis?
Answer: Unanswerable

Question: What is the National Association  for the Study of Pain's definition for pain?
Answer: Unanswerable

Question: What is an intense phenomenon? 
Answer: Unanswerable