The symptoms and signs of kidney failure depend upon the type of failure. In acute kidney failure, the patient may have oliguria (reduced urine output) along with generalised swelling (oedema) of the body together with high blood pressure. Sometimes there may be blood in the urine. In the early stages of chronic kidney failure, the patient may merely have increasing fatigue and tiredness and symptoms like nocturia (increased frequency of urination at night). Vomiting, oedema and high blood pressure eventually develop. There is also loss of appetite. Other symptoms depend upon the cause of the failure. For example, if there are kidney stones, then there may be excruciating groin pain or if there is severe haemorrhage or diarrhoea there may be signs of shock. Complications in renal failure include pulmonary oedema (presence of fluid in the lungs), severe sustained increase in blood pressure, acidosis, hyperkalaemia (increased level of potassium in the blood), and infection. If untreated, the last stage of kidney failure is almost invariably fatal.
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