Of the many things wrong with me everything (except my asthma and hay fever) is either worse on my right hand side or only on my right hand side. The list includes vision, hearing, dodgy elbow, weak joints down the leg and nose bleeds. For some reason when I get a rash from hay fever it's always on my left wrist. Now my right elbow - tap it (even very lightly) in just the right place and I get pins and needles down my whole arm for about 10 minutes, yet hit it anywhere else and it's fine.