What could cause a decrease in urine output?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Reduced urine output (oliguria) is most often caused by three main factors:

Dehydration – from vomiting, diarrhea, fever, or not drinking enough fluids
Kidney problems – such as acute kidney injury, infection, or chronic kidney disease
Impaired blood flow to the kidneys – due to heart failure, low blood pressure, or blockage in the urinary tract

Identifying the underlying cause quickly matters, because some conditions (like kidney injury or urinary obstruction) can worsen rapidly without treatment. Symptoms can overlap between minor and serious causes, making it difficult to know when to seek care based on urine output alone.

Because the causes range from easily corrected dehydration to urgent medical issues, getting personalized insight is the smartest next step. Take a free, instant, online symptom check to better understand what may be behind your decreased urine output and get clear guidance on what to do next.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn what’s causing decreased urine output Discover if your urine output is serious Find out if reduced urination needs care See OTC options for low urine output Find a doctor for urinary issues Understand medically approved home remedies Check likely causes of decreased urination

Not seeing your question? No worries.

Submit your own Question

Explanation

Decreased urine output, also known as oliguria, occurs when the body produces less urine than normal. This can happen for several reasons.

Dehydration: When the body loses more fluids than it takes in, it can lead to less urine production.
Kidney Problems: If the kidneys are not working well, they might not be able to filter and produce urine properly. This can be due to acute kidney injury, which is a sudden loss of kidney function.
Blood Flow Issues: Sometimes, the kidneys do not get enough blood flow to work properly. This can happen in critically ill patients or due to conditions affecting blood circulation.

Understanding these causes can help in identifying the underlying issue and seeking appropriate care. If you're experiencing decreased urine output or other concerning symptoms, try our free AI symptom checker to better understand what might be causing your symptoms and whether you should seek medical attention.

(References)

Chenitz KB, & Lane-Fall MB. (2012). Decreased urine output and acute kidney injury in the .... Anesthesiology clinics, 22989592.
Legrand M, & Payen D. (2011). Understanding urine output in critically ill patients. Annals of intensive care, 21906341.
Zaloga GP, & Hughes SS. (1990). Oliguria in patients with normal renal function. Anesthesiology, 2321773.

Thinking about asking ChatGPT?Ask me instead

Tell your friends about us.

We would love to help them too.

For First Time Users

What is Ubie’s Doctor’s Note?

We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.

Was this page helpful?

Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.