Usually, an acute renal failure goes like this:
There are no specific signs at the onset phase, so it is difficult to diagnose it. You may experience weakness, drowsiness, or nausea, but often these signs are ignored or go unnoticed against the background of more acute symptoms of the underlying disease.
The oliguric phase (the second one) of acute renal failure has a main symptom – a decrease in urine output, as little as 500 ml a day. It is also possible to experience muscle pain and cramps, difficulty breathing and indigestion.
If treated successfully, acute kidney failure enters the third phase (diuretic phase) and the daily urine output gradually increases and goes up to 2-2.5 liters a day. This phase tends to last for 2 weeks, however, women with underlying obstetric disease may have this phase longer because of the slow recovery of kidney function.
The recovery phase is the longest: it can take from 6 to 12 months to return kidney function back to normal. All this time, there may be some residual symptoms, such as weakness and shortness of breath.