Clinically, it is usually considered pathological oliguria when the 24-hour urine volume is less than 400 ml or the hourly urine volume is less than 17 ml. It is divided into three categories: renal, pre-renal and post-renal oliguria, which need to be handled according to the specific etiology. 1. Renal oliguria: caused by acute renal failure, acute glomerulonephritis, nephrotic syndrome and other diseases, causing dysfunction of the kidneys themselves, glomerular filtration is reduced, resulting in oliguria, and the patient will have the manifestation of facial and limb edema. At this time, we need to deal with the renal lesions according to the cause, such as hemodialysis treatment for renal failure, methylprednisolone shock treatment for acute nephritis, cyclophosphamide for immunosuppressive treatment, and glucocorticosteroids, such as oral methylprednisolone treatment for nephrotic syndrome. 2. Pre-renal oliguria: It is often due to the reduction of systemic blood volume, such as severe vomiting, diarrhea, excessive sweating, etc., which leads to excessive loss of water, and not timely replenishment of water, and then the blood volume passing through the kidneys is also reduced accordingly, and oliguria will occur. At this time, rehydration therapy is often carried out, and in severe cases, blood transfusion therapy. 3. Post-renal oliguria: it is due to the obstruction of the urinary tract caused by various reasons, such as urinary stones, prostate hyperplasia, etc., the urine can not be discharged out of the body, which will also cause oliguria. At this time, the obstruction of the urinary tract should be lifted, such as lithotripsy and stone removal treatment for urinary stones, and finasteride treatment for prostate hyperplasia. The above medications should be used under the supervision of a doctor. Oliguria may also be caused by other factors and require different treatments. If you have abnormal urine output, you should go to the hospital for examination and treatment after clarifying the cause of the disease, so as to strive for a speedy recovery.