Irritative Symptoms of LUTS
Irritative (storage) symptoms of lower urinary tract symptoms include urinary urgency, increased urinary frequency, nocturia, and urgency urinary incontinence 1, 2.
Core Irritative Symptoms
The irritative or "storage" symptoms represent bladder dysfunction during the filling phase and include:
- Urgency: Sudden compelling desire to void that is difficult to defer
- Frequency: Voiding more than 8 times per 24 hours
- Nocturia: Waking at night to void
- Urgency urinary incontinence (UUI): Involuntary urine leakage accompanied by or immediately preceded by urgency 1, 2
These contrast with obstructive (voiding) symptoms such as weak stream, hesitancy, straining, and intermittency, which occur during the voiding phase 3.
Clinical Significance and Bother
Storage symptoms are typically more bothersome to patients than voiding symptoms, despite voiding symptoms being more frequent 4. At the individual level, urgency urinary incontinence is the most bothersome symptom for both men and women, while at the population level, urgency, stress urinary incontinence, and nocturia cause the greatest burden 5.
Storage symptoms can result from overactive bladder detrusor (detrusor overactivity), bladder outlet obstruction from benign prostatic hyperplasia, or both conditions simultaneously 2. These symptoms negatively affect quality of life and interfere with daily activities, sexuality, and sleep 4.
Pathophysiology Context
In men with LUTS, irritative symptoms may arise from:
- Overactive bladder detrusor: Involuntary bladder contractions causing urgency and frequency
- Bladder outlet obstruction: Secondary bladder changes from prostatic enlargement leading to detrusor instability
- Mixed etiology: Both mechanisms contributing simultaneously 2, 6
The 2024 AUA/SUFU guidelines emphasize that overactive bladder is characterized primarily by urgency, with or without urgency incontinence, usually accompanied by frequency and nocturia 1.