1, foam in the urine is protein urine If there is protein in the urine, the urine will bubble, and it will not dissipate easily for a long time, but the urine without protein, sometimes it will also bubble, but it will dissipate in a while, so there is foam in the urine, it is best to check a urinary routine. 2, frequent urination, lumbar acidity is the precursor of around Kidney disease, especially nephritis, can appear lumbar acidity, but generally not lumbar pain, most lumbar acidity, lumbar pain is the problem of the lumbar spine, kidney disease is not necessarily frequent urination, but can appear increased nocturia, there is frequent urination to consider kidney disease, but if frequent urination, lumbar pain together, urinary tract infection is more likely. 3, whether kidney deficiency is equal to kidney insufficiency Kidney deficiency is what Chinese medicine calls kidney deficiency, and Western medicine’s kidney insufficiency is not the same thing, of course, kidney insufficiency can appear as a manifestation of kidney deficiency, kidney deficiency may also be other diseases, or just a subhealth state. 4, eat kidney to supplement the kidney is justified Eat kidney to supplement the kidney is not suitable for all cases of kidney disease, for good kidney function of nephritis patients, supplemental animal offal is beneficial, but for patients with kidney failure, will make the kidney function worse. 5, lower limb swelling is the performance of kidney disease lower body swelling first consider whether the kidney problems, you can check a urine routine, but the heart, liver problems, there will also be edema. Especially in middle-aged and elderly women, edema occurs, mostly related to endocrine dysfunction.