What is the reason for women's low urine output?

When female friends suddenly have less urine volume, they will worry about their bodies, thinking that they have a serious disease that triggers this clinical manifestation. In fact, there are many reasons for low urine volume, and sometimes it is not caused by pathological reasons, so don’t worry too much. You still need to do a detailed urine test. If the low urine volume is caused by kidney disease, it must be treated as soon as possible.

1. Prerenal oliguria

Insufficient renal perfusion due to various reasons and a sharp drop in glomerular filtration rate are called prerenal oliguria and anuria.

(1) Insufficient blood volume: It starts with functional oliguria and anuria. Once the blood volume is replenished, the urine volume will recover immediately. If it is not diagnosed and treated in time, it may cause organic kidney damage. Acute renal failure, manifested by oliguria or anuria, is seen in severe dehydration, massive bleeding, extensive burns, etc.

(2) Shock: Shock due to various reasons causes a decrease in renal perfusion pressure and a serious deficiency in glomerular filtration rate, which is seen in anaphylactic shock, hemorrhagic shock, cardiogenic shock, infectious toxic shock, etc.

(3) Decreased cardiac output: At this time, the blood supply to the kidneys decreases significantly, which is seen in left heart failure, severe arrhythmias, cardiac tamponade and constrictive pericarditis.

(4) Hepatorenal syndrome: In the late stage of cirrhosis, there is severe ascites and severe renal hypoperfusion, which manifests as oliguria or anuria. Once the ascites from cirrhosis is relieved, the kidneys will recover and the urine volume will increase. In hepatorenal syndrome, pathological examination of the kidneys is normal.

2. Renal oliguria and anuria

(1) Renal parenchymal damage: Whether it is primary glomerulonephritis or secondary to systemic lupus erythematosus, polyarteritis nodosa, infective endocarditis, dermatomyositis, etc., it can cause renal parenchymal damage.

Damage or even renal impairment or failure causes oliguria or anuria.

In the late stage of chronic renal failure, the kidneys atrophy, the glomerular filtration rate decreases, and the urine volume may be significantly reduced or even anuria; in the oliguria and anuria stage of acute renal failure, the symptoms are oliguria and anuria.

(2) Renal interstitial disease: The most common drug allergies such as penicillin, sulfonamides, rifampicin, aminoglycosides, etc. cause renal interstitial damage. It is also seen in the late stage of renal damage in chronic pyelonephritis.

Acute pyelonephritis is seen in renal papillary necrosis.

Heavy metal salt poisoning is seen in poisoning by mercury, lead, arsenic, gold, etc.