How long does it take to recover from contrast agent damage to the kidneys in general is related to the presence of risk factors for contrast agent nephropathy and so on. If the patient has no underlying disease or risk factors, the patient can usually recover gradually in 7~10 days; if the patient has chronic kidney disease, diabetes mellitus, advanced age, heart failure and other high-risk factors, some patients may experience renal failure, and the specific recovery time cannot be determined. Contrast nephropathy refers to acute kidney injury that occurs within 72 hours after intravascular injection of iodine contrast agent and excludes other causes of kidney injury. Elevated creatinine is mostly seen within 24~48 hours after contrast, and peaks on the 3rd~5th day, and there may be a small amount of proteinuria, hematuria, tubular urine, increased urinary enzymes, and decreased urinary concentrating function. Most of the creatinine gradually recovered to the basal level on the 7th~10th day. However, some patients may have transient oliguria, and in severe cases, anuria may occur, even requiring dialysis treatment. Especially patients with risk factors such as chronic kidney disease, diabetes mellitus, advanced age and heart failure may develop renal failure, when the specific recovery time cannot be determined. If patients develop contrast nephropathy, it is recommended to go to regular hospitals in time and standardize the treatment under the guidance of doctors.