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Published on: 8/18/2026

What causes decreased urine output during pregnancy?

Decreased urine output during pregnancy is often caused by preeclampsia, a serious condition that impairs kidney function and disrupts fluid balance. Other potential causes include dehydration, urinary tract infections, and gestational hypertension. Because reduced urination can signal a pregnancy complication that needs prompt evaluation, understanding your symptoms early is critical. Take a free, instant, online symptom check to better identify possible causes and confidently plan your next steps.

Reviewed for medical accuracy: 07/14/2026

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Explanation

Decreased urine output during pregnancy, also known as oliguria, can happen due to several reasons. One common cause is a condition called preeclampsia. Preeclampsia can affect the kidneys and how they handle water, leading to less urine being made. This happens because the body holds onto more water and salt.

Here are some key points:

  • Preeclampsia: This condition involves high blood pressure and can lead to less urine production because it affects the kidneys' ability to filter and excrete water.
  • Persistent Oliguria: In severe cases of preeclampsia, urine output can remain low even with treatment.
  • Treatment Options: Sometimes, medications like low-dose dopamine are used to try and increase urine output by helping the kidneys work better.

It's important for pregnant individuals experiencing decreased urine output to seek medical advice, as it could be a sign of a condition that needs treatment. If you're noticing changes in your urination patterns or other concerning symptoms, you can use Ubie's free AI symptom checker to help identify possible causes and determine when to seek care.

(References)

  • Ross MG, Hayashi R, Murad S, Leake RD, Ervin MG, & Fisher DF. (1985). Water excretion in preeclampsia: behavior as nephrotic .... American journal of perinatology, 4052179.

  • Katz VL, Dotters DJ, & Droegemueller W. (1990). Low dose dopamine in the treatment of persistent oliguria .... International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 1968019.

  • Clark SL, Greenspoon JS, Aldahl D, & Phelan JP. (1986). Severe preeclampsia with persistent oliguria. American journal of obstetrics and gynecology, 3953696.

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