swelling and pitting can be a sign of liver , kindey or cardiac disease. Even it could be part of poor venous drainage
of the legs or hormone imbalance
. since you are quit physically active we can probably rule out cardiac diasease. urine routine examination, serum creatinine
level, serum protein and albumin
level will help in ruling out kidney disease. decrease your salt intake and water intake should not be more than 2 litres / day until unless you are sweating too much . i think this should help.