my left ring finger is a 5.5 and can driop down to a 5 when its cold. my right ring finger is a 6 because i had broken it before and so its just a tad larger. My thumbs are the same size as my ring fingers (i find that odd!)
In the last month, my ring size has increased. I now wear a size 7. I'm pretty surprised, but it is true that I can't fit my old rings that were a 6.5!