Urinary Tract Infection (UTI): This is a common condition in children, especially girls, and can cause frequent urination due to irritation of the bladder and urethra. The absence of nocturnal symptoms (bedwetting or urge to urinate at night) does not rule out UTI, as the infection can cause daytime symptoms without necessarily affecting nighttime bladder control.

Diabetes Mellitus: Although less common in children, diabetes can cause frequent urination (polyuria) due to high blood sugar levels. Other symptoms might include increased thirst, weight loss, and fatigue.
Constipation: Chronic constipation can put pressure on the bladder, leading to frequent urination. This is a common issue in children and can be associated with other gastrointestinal symptoms.
Overactive Bladder: This condition can cause a frequent need to urinate during the day, often without an increase in fluid intake. It might be associated with urgency but not necessarily incontinence.

Diabetes Insipidus: A rare condition characterized by the inability to regulate fluids in the body due to problems with the antidiuretic hormone (ADH). It leads to excessive thirst and urination. Although rare, missing this diagnosis could lead to severe dehydration and electrolyte imbalances.
Kidney Stones: Although uncommon in children, kidney stones can cause severe pain and frequent urination. The absence of pain does not rule out this condition entirely, as some children might not complain of pain or might have a different presentation.
Tumor or Mass in the Pelvis: Rarely, a tumor or mass in the pelvis can compress the bladder or urethra, leading to urinary frequency. This would be an unusual cause but is critical not to miss due to the potential for serious underlying disease.

Neurogenic Bladder: This condition results from a lack of bladder control due to a neurological condition affecting the nerves that control the bladder. It can cause a variety of urinary symptoms, including frequency, but is less common in children without a known neurological disorder.
Urethral Stricture or Obstruction: A narrowing or blockage of the urethra can cause urinary frequency among other symptoms. This is rare in children and more commonly associated with trauma, infection, or congenital abnormalities.
Endocrine Disorders: Certain endocrine disorders, such as hyperthyroidism or Cushing's syndrome, can cause increased urination among other systemic symptoms. These conditions are rare in children and would typically be associated with a range of other symptoms.