Tendonitis
"Fell onto my shoulder off my sons skate board, initially felt no discomfort, but my shoulder a week or so after began to become painful, enough to stop me swimming. Waited 3 months for it to go, no reduction on pain, went to doctor who prescribed Naprosyn within a day or two pain had eased, carried on for 2 weeks and now swim regularly, very slight discomfort but take remaining pills as and when needed, but discomfort so small rarely have to take them. 
Negatives, I think when taking medication I suffered stomach discomfort."