Edema and the causes of

Ed finished up chemo a few days ago, but has been having some swelling in the ankles. A call to the oncologist and we think he is drinking too much Gatorade (loaded with sodium) for a sedentary life style. After 24 hours without Gatorade the swelling has gone down, but his leg still giving some problems. Is it a side effect of the chemo or is it a new blood clot? He gets blood work done Friday and back to oncologist Monday. Maybe some answers on Monday. Hoping he can hang tough till Monday!