It can be physiological swelling.. Need to rule out
kidney and cardiac cause for swelling.
Pain can be because of many causes, like.. Due to sprain / arthritis etc.
Next Steps
Better to consult orthopaedic surgeon with xray of that ankle AP And lateral view... Few investigations - CBC,
CRP, KFT, RBS
Health Tips
apply Crepe bandage, hot water fermentation, rest, limb evelavtion during rest.