CD,
Tumeric is not a diuretic as far as I know and I haven't seen anything in the literature about it being one. It is an anti inflammatory and a very mild anticoagulent. The anti inflammatory properties are what help in reducing the swelling. One other thing I noticed the first official time I had the temperature between limb measured was with this new doctor and it was a few degrees difference. However I also noticed by touch that once I started taking tumeric the temperature difference seemed not as much as well. I am thinking the tumeric improves overall circulation and that is why the swelling g went down and the limb to me at least felt colder prior to my taking it.
I also read that 80% of patients with CRPS have temp difference but 20% don't. I found that interesting as well.