What is the problem with low urine output and low urine output

Low urine volume, oliguria, need to go to the hospital for further examination, and need to count the 24-hour total urine volume, to judge whether there is pathological significance of oliguria: first, if the water consumption throughout the day is less or show fever, nausea, vomiting, etc., resulting in excessive fluid loss, will show reduced urine volume, appropriate rehydration or appropriate drinking water after urine returns to normal, it is caused by dehydration, only need to properly supplement liquid can be. Second, the 24-hour urine volume