Includes online library of pain articles, 'ask the expert' columns, a forum, and an international directory of pain clinics, and daily news, for patients and practitioners.
http://www.pain.com/

Pain, in the sense of physical pain, is a typical sensory experience that may be described as the unpleasant awareness of a noxious stimulus or bodily harm.
http://en.wikipedia.org/wiki/Pain

Pain is an industrial metal band from Sweden. The band started out as a hobby project for front man Peter Tägtgren, whose idea was to fuse metal with techno influences.
http://en.wikipedia.org/wiki/Pain_%28Swedish_band%29

noun . 1. physical suffering or distress, as due to injury, illness, etc.
http://dictionary.reference.com/search?q=pain&r=66

Pain ... Pain is a feeling triggered in the nervous system. Pain may be sharp or dull.
http://www.nlm.nih.gov/medlineplus/pain.html