Contrast nephropathy is a condition that occurs when a patient has an allergic reaction after undergoing a medical imaging procedure that requires the use of contrast dye. There are several synonyms for contrast nephropathy, including contrast-induced nephropathy, radiocontrast-induced nephropathy, and contrast-induced acute kidney injury. All of these terms refer to the same medical condition. Contrast nephropathy can be a severe medical condition that requires prompt treatment. Symptoms include decreased urine output, nausea, and abdominal pain. Patients who are at a higher risk of developing the condition should take proper precautions to avoid contrast agents or use alternative imaging methods.