Pain intermittent for 5 months under right shoulder in back, doesn't hurt at rest, i'm a hairdresser for a living, ibuforen helps! should i be concerned?

Varies: There are many potential causes, many of them are quite benign, but you may want to be seen just to make sure it is not something serious. A pulmonary embolus, although not terribly common, can cause similar complaints and is potentially life threatening. More common causes would be pluerisy, pneumonia, periscapular bursitis, and a thoracic radiculopathy. An exam can usually tell the cause.