What's the reason of swollen feet due to hydronephrosis?

My grandfather is a diabetic, there have hydronephrosis after illness, the phenomenon now appears swollen feet, why?



Swollen feet are generally signs of cardiac dysfunction ah.

Look up renal function and urine analysis, renal insufficiency, proteinuria is not, there is degeneration of blood vessels caused by diabetes lead to diabetic foot, heart problems may also be recommended to the hospital or check the track bar system