Subtypes
The nocturnal-only subtype of enuresis, sometimes referred to as monosymptomatic enure-
sis, is the most common subtype and involves incontinence only during nighttime sleep,
typically during the fi rst one-third of the night. The di urnal-only subtype occurs in the
absence of nocturnal enuresis and may be referred to simply as urinary incontinence.  Indi-
viduals with this subtype can be divided in to two groups. Individu als with “urge incon-
tinence” have sudden urge symptoms and de trusor instability, whereas individuals with
“voiding postponement” consciously defer micturition urges until incontinence results.
The nocturnal-and-diurnal subtype is also known as nonmonosymptomatic enuresis.
Diagnostic Features
The essential feature of enuresis  is repeated voiding of urine during the day or at night into
bed or clothes (Criterion A). Most often the voiding is involuntary, bu t occasionally it may