Excessive volume of urination means that you release abnormally large amounts of urine each day. The medical term for this condition is polyuria. 

An excessive volume of urination for an adult would be at least 2.5 liters of urine per day.

Polyuria is a fairly common symptom, which is often noticed when you have to get up to use the bathroom at night.

• Too much fluid intake, particularly fluids containing caffeine or alcohol
• Too much salt or glucose (if diabetic)
• Drug use, especially diuretics
• Diabetes (including diabetes insipidus)
• Psychogenic polydipsia, most common in women over age 30
• Renal failure
• Sickle cell anemia
• Radiographic tests that use a contrast media
  • Urine volume will increase for up to 24 hours following the dose

Intake and output of fluids should be monitored. Record daily weights at the same time(s) and on the same scales.

• Excessive urination occurs over several days, and it is not explained by medications or increase in fluids.

The health care provider will perform a physical exam and ask you questions about your symptoms, including:

• Time pattern
  • How long has this been noticed?
  • Does the volume of urine remain comparable from one day to the next?
  • Is the volume large one day and small the next day?
  • What time of day does the problem seem worse?
• Quality
  • What color is the urine?
  • Has any blood been noticed in the urine?
  • How many times each day is urination necessary? What about at night?
  • Any problems controlling urine?
• Aggravating factors
  • What makes the problem worse?
  • Does drinking large volumes of fluid increase the urine volume?
• Relieving factors
  • Is there anything that helps relieve the problem?
  • Does restricting fluid intake reduce the urine volume?
• Other
  • What other symptoms are also present?
    • Is there any pain or burning when urinating?
    • Is there back or abdominal pain?
    • Is there a fever?
    • Is bed wetting a problem?
  • What medications are being taken?
  • Is there a family history of diabetes or kidney problems?
  • Has there been previous urinary tract infections?
  • Dietary factors: What is the amount of fluids consumed each day? Salt? Caffeine? Alcohol?

Diagnostic tests that may be performed include:

• Urinalysis
• Serum glucose (sugar) test
• Blood urea nitrogen test
• Creatinine studies
• Fluid deprivation test (the intake of fluids is restricted to see if the urine volume decreases)
• Serum osmolality and urine osmolality tests
• Serum electrolytes