Swollen legs, a pit when pressed, belong to sunken edema, the most common cause is still caused by kidney disease, more common is nephrotic syndrome. For this situation, first of all, you need to go to the hospital to check the urine routine, if there is a positive urine protein, often suggesting that there is kidney disease, it is necessary to further check the 24h urine protein quantification, blood albumin as well as kidney function, kidney ultrasound and other related indicators. If the urine protein quantification is more than 3.5g and plasma albumin is less than 30g/L, it can be diagnosed as nephrotic syndrome. At this time, further examination of renal puncture is needed to clarify the specific pathological type and choose hormone or combined immunosuppressive therapy according to the pathological type. The diet should be low salt, low fat and high quality protein diet to avoid sodium retention and increase the burden on the kidneys. Treatment can also include Bering capsules to protect the kidneys and Huangkui capsules to reduce urinary protein and symptomatic treatment. It is also important to exclude diseases of hepatogenic, cardiogenic and hypothyroidism.