Nighttime urination (nocturia) means waking from sleep one or more times to urinate. This page gives general information about common causes, how clinicians assess it, and which specialties may be involved. For personal medical concerns, contact a healthcare provider.
Nocturia is the need to get up from sleep to pass urine. Occasional nighttime urination happens to many people and may not indicate a problem, but frequent awakenings can disrupt sleep and daily life. Frequency often increases with age, and the pattern and impact on sleep help guide evaluation.
Many factors can contribute to nocturia. Typical causes include urinary tract infections, benign prostatic enlargement in men, overactive bladder, diabetes, fluid redistribution related to heart failure, obstructive sleep apnea, evening excess fluids or caffeine/alcohol intake, and some medications. Age, obesity and chronic medical conditions can increase risk.
Evaluation usually begins with a medical history and a bladder diary recording daytime and nighttime voids. Common initial tests include urinalysis, blood glucose and basic kidney function tests. In some cases clinicians check post-void residual volume with bladder ultrasound, assess the prostate in men, or order urodynamics or sleep studies if indicated.
Primary care (family medicine) is a common first contact and can arrange referrals to urology, gynecology, endocrinology, cardiology or sleep medicine depending on findings. Seek urgent evaluation at a healthcare facility if you cannot pass urine, have a high fever, severe abdominal or back pain, visible blood in the urine, fainting or other alarming symptoms.
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