Overactive Bladder (OAB): This condition is characterized by a sudden, intense urge to urinate, often with frequent urination. It's a common issue in postmenopausal women due to hormonal changes and is consistent with the absence of UTI or hematuria.

Diabetes Mellitus: Frequent urination (polyuria) is a classic symptom of uncontrolled diabetes. Although not as directly related to the urinary system as OAB, it's a common condition that could explain the symptoms.
Menopause-related Vaginal Atrophy: Decreased estrogen levels can lead to vaginal atrophy, which may cause urinary frequency due to irritation or decreased bladder capacity.
Benign Prostatic Hyperplasia (BPH) in Men is analogous to Pelvic Organ Prolapse in Women: While BPH is a male condition, pelvic organ prolapse in women can cause similar urinary symptoms due to the mechanical pressure on the bladder.

Diabetes Insipidus: A rare condition characterized by the inability to regulate fluids in the body due to problems with the antidiuretic hormone (ADH). It can lead to severe polyuria and polydipsia.
Interstitial Cystitis: A condition causing bladder pressure, bladder pain, and sometimes pelvic pain. The symptoms can mimic those of a UTI but without evidence of infection.
Cancer of the Urinary Tract: Although less common, urinary frequency can be a symptom of bladder, ureteral, or renal cancer. Given the potential severity, it's crucial not to miss this diagnosis.

Neurogenic Bladder: Results from a lack of bladder control due to a brain, spinal cord, or nerve problem. Symptoms can include frequent urination, depending on the type of neurogenic bladder.
Sjögren's Syndrome: An autoimmune disorder that can affect various parts of the body, including the kidneys, leading to symptoms like frequent urination.
Tuberculosis of the Urinary Tract: A rare condition in many parts of the world but can cause symptoms like frequent urination, especially if it involves the kidneys or bladder.