Swollen ankles -cause???

I noticed today my ankles are pretty swollen- I am not prone to this- and am wondering if any of you have had this happen and what you did for it. I hate to havve to start taking yet another pill- I am currently on a minimal dose 2mg every other day of decadron so I dont think that is it- and the only other meds I am on are ones I have been on for a long time. I am inclined to waait and wach to see if it goes away on its own before telling my dr. I dont eat alot of salty foods. Any help would be appreciated.