Uraemia is a medical condition that refers to an excess of urea in the blood due to kidney failure. Other terms that can be used to describe this condition include azotaemia, uremic syndrome, renal dysfunction, and kidney disease. Azotaemia is a term that is used to describe elevated levels of nitrogen compounds in the blood, not just urea. Uremic syndrome is a group of symptoms associated with kidney failure, including fatigue, nausea, and anemia. Renal dysfunction refers to a broad range of kidney disorders, including infections, structural abnormalities, and chronic disease. Kidney disease is a catch-all term that includes any condition that affects the kidneys' ability to filter waste from the blood.