Early symptoms of renal impairment: 1. Patients may have symptoms of back pain and weakness. 2. Patients often experience loss of appetite, nausea, discomfort and other digestive symptoms. 3. Patients with renal impairment may experience edema in the early stages, especially edema of the eyelids. But there are some patients with early renal impairment do not appear and any main symptoms of discomfort, so we often call kidney disease is an invisible killer. Therefore, it is recommended that we should have regular annual medical checkups to check our kidney function and urinary routine and other related test results, and if we find any abnormalities in the early stage, we should go to the hospital for consultation in time to avoid delaying our condition.