To see if there are problems with the kidneys, you can look at 4 aspects: 1. Observe the symptoms, whether the patient has edema, increased foam in the urine and red urine these symptoms. A more common manifestation of many kidney diseases is the appearance of edema, which can be eyelid edema or bilateral lower limb edema. In most cases, increased urine foam indicates the presence of urine protein in the urine, and red urine generally indicates the presence of carnal hematuria. 2. Check the urine routine to observe whether there is urine protein, red blood cells or occult blood. If there is urine protein or red blood cells, it suggests possible nephritis. 3, perform kidney function test, observe whether creatinine and urea are elevated, if elevated, it suggests kidney failure. 4, perform kidney ultrasound examination, kidney ultrasound examination is mainly to observe whether there is any change in the appearance of the kidney, especially the shrinkage, if it is shrinkage, it suggests chronic kidney disease.