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Nocturia

Nocturia is waking one or more times during the main sleep period to urinate, with significance determined by frequency and daytime impact.

Key takeaways

  • A frequency–volume diary separates excess night urine production from a small bladder capacity or waking for another reason.
  • Leg swelling, sleep apnoea, diabetes, heart failure, evening fluid and diuretic timing can increase night urine.
  • Desmopressin helps selected nocturnal polyuria but can cause dangerous low sodium, particularly in older adults.

The listings below do not identify the nocturia mechanism; fluid balance, sodium, kidney and heart health affect treatment.

Finding why night urine increases

The diary records intake, void time and volume over several days. Urine testing, glucose, kidney function and examination are selected from symptoms. Urgency and small voids suggest bladder storage problems, while large night volumes indicate nocturnal polyuria.

Matching treatment to cause

Adjust evening fluid, alcohol and caffeine, and move diuretics earlier only with prescriber advice. Treat sleep apnoea, leg oedema, diabetes or prostate and bladder disease where present. Desmopressin requires baseline and follow-up sodium checks and strict evening fluid restriction.

When to seek urgent care

Seek urgent care for inability to urinate, fever with flank pain, visible blood with clots, severe breathlessness or confusion. Headache, vomiting, confusion or seizure after desmopressin is an emergency.