Renal failure can be detected in the early stage by renal function indexes such as urea nitrogen, blood creatinine, cystatin C and so on. Renal failure can be divided into acute renal failure and chronic renal failure. When patients develop renal failure, it can be manifested as elevated urea nitrogen, blood creatinine, cystatin C and other related renal function indicators, or decreased glomerular filtration rate. Therefore, renal failure can be detected in early stage. There may be no specific symptoms in the early stage of renal failure. Some patients may have nausea, vomiting, fatigue, etc. In severe cases, edema and oliguria may occur. If patients find kidney failure, it is recommended to go to regular hospitals in time and standardize the treatment under doctors’ guidance.