Clinical exam · Kidney, genitourinary, breast and obstetric exam

Urinary symptoms: dysuria, frequency, oliguria and hematuria !

Topic

Burning when passing urine, passing urine very often, passing very little, or seeing blood: what each symptom means and how to ask about it.

Updated 2026-11-01

See it in 3D: Kidneys · Ureters · Urinary bladder

What it is

Urinary symptoms fall into irritative symptoms (dysuria, frequency, urgency, nocturia), obstructive symptoms (weak stream, straining, dribbling, retention), changes in volume (polyuria, oliguria, anuria) and changes in how the urine looks (hematuria, foamy or cloudy urine). Naming them precisely points to where the problem is: bladder and urethra, prostate, kidney or the body's fluid status. Telling frequency from polyuria, and oliguria from urinary retention, is a classic exam question.

Key facts

Dysuria: pain or burning on voiding; the most common cause is infection or inflammation of the bladder or urethra.
Frequency: voiding more often than usual, nearly always in small amounts; the total daily volume can be normal.
Urgency: a sudden, strong need to void that is hard to delay; urge incontinence is the leakage that follows it.
Nocturia: waking at night to void; seen in prostatic hyperplasia, heart failure, diabetes and chronic kidney disease.
Polyuria: a raised total urine volume, more than about two and a half to three litres a day in adults (diabetes mellitus, diabetes insipidus, diuretics).
Oliguria: less than about 400 to 500 millilitres of urine in 24 hours; anuria: less than about 50 to 100 millilitres in 24 hours.
Hematuria: blood in the urine, either visible (gross) or seen only on urinalysis (microscopic).

Step by step

Ask in plain words: 'Does it burn or hurt when you pass urine?', 'How many times do you go during the day, and at night?'
Separate frequency from volume: 'Do you go often but pass only a little, or pass a lot each time?'
Explore obstruction: 'Is it hard to start? Is the stream weak? Do you feel the bladder is not empty afterwards?'
With red urine: 'Is the blood at the start, at the end or throughout? Are there clots or pain?'
Look for associated symptoms: fever, flank pain, vaginal or urethral discharge, swelling, foamy urine, intense thirst.
Review medicines, foods and hard exercise that change urine colour or volume.

Urinary symptoms and what they usually point to

Symptom	What it is	Common causes
Dysuria	Pain or burning on voiding	Cystitis, urethritis, prostatitis, vaginitis, sexually transmitted infections
Frequency and urgency	Many small voids, sudden urge	Urinary infection, overactive bladder, prostatic hyperplasia, pregnancy
Obstructive symptoms	Weak stream, straining, dribbling, incomplete emptying	Prostatic hyperplasia, urethral stricture, neurogenic bladder
Polyuria	Raised total volume	Diabetes mellitus or insipidus, diuretics, high water intake
Oliguria or anuria	Very low total volume	Dehydration, shock, acute kidney injury, complete obstruction
Hematuria	Blood in the urine	Stones, infection, bladder or kidney tumour, glomerulonephritis

Clinical notes

Dysuria with frequency and urgency, without fever or flank pain, suggests cystitis; add fever, chills and flank pain and pyelonephritis comes to mind.
Oliguria means sorting three causes: prerenal (low volume or perfusion), renal (damage to the kidney tissue) and postrenal (obstruction). Sudden anuria suggests complete obstruction or a vascular event.
Painless gross hematuria in an older smoker suggests a bladder tumour until proven otherwise.
Hematuria with clots and colicky flank pain radiating to the groin points to a urinary stone.
Tea-coloured or cola-coloured urine with swelling and hypertension points to a nephritic syndrome; very foamy urine suggests heavy proteinuria.
Red urine with no red cells under the microscope (pseudohematuria) can come from beetroot, some medicines, or free hemoglobin or myoglobin.

In the lab

Urinalysis with microscopy is the first test: white cells and nitrites (infection), dysmorphic red cells and red cell casts (glomerular source), protein.
In nursing, the fluid balance chart (intake and output) and hourly urine output in a catheterised patient are how oliguria is caught early; a falling output is reported at once.

Test yourself

Think of the answer, then tap the question to see it.

What is the difference between urinary frequency and polyuria?

Frequency is voiding more often, usually small amounts; polyuria is a raised total daily urine volume.

Below what daily volume is an adult's urine output called oliguria?

Below about 400 to 500 millilitres in 24 hours; below about 50 to 100 millilitres it is called anuria.

What does painless gross hematuria suggest in a 70-year-old man who smokes?

A urinary tract tumour, above all of the bladder, until proven otherwise.

Which urine microscopy finding shows that hematuria comes from the glomerulus?

Dysmorphic red cells and red cell casts.

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See it in 3D

The structures of Durgical's 3D anatomy where it is found.

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Educational content on the clinical exam; it is learned and practised under supervision. It does not replace assessment by a health professional and is not for self-diagnosis.

Sources: Urine output - decreased (MedlinePlus (U.S. National Library of Medicine), 2024); Urination - painful (MedlinePlus (U.S. National Library of Medicine), 2024); Urine - bloody (MedlinePlus (U.S. National Library of Medicine), 2024); 25.1 Physical Characteristics of Urine - Anatomy and Physiology 2e | OpenStax (OpenStax, 2022).

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