3. Medications
Some medications, especially diuretics (“water pills”) used for high blood pressure or heart conditions, are taken in the evening — leading to increased urination at night.
4. Pregnancy
As the uterus expands, it puts pressure on the bladder.
This is common in the second and third trimesters — and usually resolves after delivery.
5. Medical Conditions
Frequent nighttime urination can be a red flag for several serious health issues:
Diabetes (Type 1 & 2)
High blood sugar causes excess urine production (polyuria)
Diabetes Insipidus
A rare condition where the body can’t regulate fluid balance
Urinary Tract Infection (UTI)
Irritates the bladder, causing urgency and frequency
Enlarged Prostate (BPH)
Compresses the urethra, leading to incomplete emptying and frequent urges
Congestive Heart Failure
Fluid pools in legs during the day; when lying down, it returns to circulation and gets filtered by kidneys at night
Chronic Kidney Disease
Impaired kidney function affects urine concentration
Sleep Apnea
Low oxygen levels trigger hormone changes that increase nighttime urine
6. Sleep Disorders
Conditions like insomnia, restless legs syndrome, or obstructive sleep apnea can fragment sleep, making you more aware of bladder sensations — even if urine volume is normal.
Symptoms of Nocturia
You may have nocturia if you:
