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Urine and Urination
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Kidneys Urinary System

Urine and Urination

The kidneys filter waste from the blood to create urine, which is stored in the bladder until it is ready to be excreted.

The Urinary Process

Your kidneys make urine by filtering wastes, known as urea, and extra water from your blood. Urine travels from the kidneys down two thin tubes called ureters to the bladder. The bladder stores the urine, swelling into a round shape when full and shrinking when empty. A healthy bladder can typically hold up to 16 ounces (2 cups) of urine comfortably for 2 to 5 hours.

Urinary Problems

You may experience issues with urination if you have any of the following conditions:

  • Kidney failure
  • Urinary tract infections
  • An enlarged prostate
  • Bladder control problems, such as incontinence, overactive bladder, or interstitial cystitis
  • A blockage preventing the bladder from emptying

Diagnosis and Treatment

Certain conditions may cause blood or protein to appear in your urine. If you suspect a urinary problem, consult your health care provider. Urinalysis and other urine tests are used to diagnose the underlying issue, and treatment is determined based on the specific cause.

Frequently Asked Questions

Most healthy adults urinate between six and eight times per day, though a range of four to ten times is generally considered normal depending on fluid intake and bladder capacity. Waking up once or twice during the night to urinate, known as nocturia, is common, especially in older adults. However, if you are waking up more than twice a night or experiencing a sudden, significant increase in frequency, it may indicate an underlying issue such as an infection, diabetes, or prostate enlargement that requires medical evaluation.
Early signs of a urinary tract infection (UTI) often include a burning or painful sensation during urination, a frequent urge to urinate even when the bladder is empty, and urine that appears cloudy or has a strong, unpleasant smell. Some individuals may also experience lower abdominal pain or pressure. While these symptoms can sometimes resolve with increased hydration, they often require antibiotic treatment to prevent the infection from spreading to the kidneys, which can lead to more serious complications like fever, chills, and back pain.
While urine color can vary from pale yellow to dark amber based on hydration levels, certain changes warrant immediate attention. Cloudy urine, a strong or foul odor, or the presence of blood (which may appear pink, red, or brown) are common signs of a urinary tract infection or other conditions. Additionally, if you notice foam that persists after flushing, it could indicate protein in the urine, a potential sign of kidney damage. These symptoms should be reported to a healthcare provider for a urinalysis to determine the cause.
Yes, dietary choices play a major role in urinary health. Consuming high amounts of caffeine, alcohol, or artificial sweeteners can act as diuretics, increasing urine production and bladder irritation, which leads to more frequent urges to urinate. Conversely, adequate water intake helps dilute urine, reducing the risk of crystals forming and lowering the likelihood of kidney stones or infections. Limiting fluid intake three to four hours before bedtime can also help reduce nighttime urination and improve sleep quality.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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