James the Greater was the patron Saint of arthritis (gawd bless 'im) and other things such as rheumatism; apothecaries; blacksmiths; druggists; equestrians; furriers; horsemen; knights; laborers; pharmacists; pilgrims; rheumatoid sufferers; riders; soldiers; tanners; veterinarians.
Take your pick
Saints Fiacre, George, Saturninus of Toulouse and Symphorian of Autun were all patron Saints of sexually transmitted diseases (not bad for an atheist, if I say so myself!!)
Jim Carroll