I'm currently in flange-size hell. I've tried to figure out my size with measurements (huge fail, way too small) and have tried a variety of sizes. No matter what size flange my nipple will swell to fill it. The flange will look gigantic when held up to my nipple but once I start pumping my nipple always swells and fills the flange. I have very small areolas that mostly disappear into my nipple when erect and are completely gone when pumping so using that as a reference is difficult. I'm wondering if maybe my suction is too high? I can go all the way to the highest setting on my Medela and it doesn't hurt. I think I've found the best size for my right breast though, so i'm not sure the suction is the problem if it's only affecting one nipple. If i'm not feeling pain then is the suction level okay? Will the nipple look a certain way (mine look puffy and swollen) if it's too strong? I know it's possible to use different sizes on your breasts but I am struggling to find the right size.