Oliguria is the medical term for a decreased output of urine. 

ओलिगुरिया (अल्पमूत्रता) तब होता है जब आप सामान्य से कम पेशाब करते हैं। 

If you have oliguria, it means that your kidneys are not producing enough urine. 

Causes include dehydration, an injury, blockage in the urinary tract, or certain medications.

Urinary tract obstruction

A urinary tract obstruction or blockage occurs when urine can’t leave your kidneys. 

This can affect one or both kidneys and usually results in decreased urine output.

Obstruction can occur as a result of various conditions or diseases such as:-

01. benign prostatic hyperplasia (BPH)

02. phimosis

03. kidney stones

04. prostate cancer

05. constipation

06. Retroperitoneal inflammation

07. endometriosis that affects the bladder

best treated by Dr. Dilip Raja, Best Urologist Andrologist Mumbai.