What causes sudden frequent urination?

A Urinary Tract Infection can cause frequent small amounts, burning, urgency, cloudy urine or lower abdominal discomfort. Passing large volumes with marked thirst may point towards high blood glucose, including Type 1 Diabetes, Type 2 Diabetes or Prediabetes. In men, Prostatitis may cause urinary frequency with pelvic discomfort, fever or painful urination; Benign Prostatic Hyperplasia can make the stream weak, delay starting or leave a feeling of incomplete emptying. Caffeine, alcohol, diuretic medicines, anxiety and pregnancy can also change bladder habits. Chronic Kidney Disease may affect urine patterns, but symptoms alone cannot establish the cause.

Note when the change began, how often you pass urine, whether each amount is small or large, and any pain, thirst, fever, discharge or back pain. Drink normally rather than forcing excessive water, and reduce caffeine and alcohol temporarily. Arrange a clinical review for sudden, persistent or unexplained frequency. A clinician may check urine, blood glucose, medicines, kidney function and, when relevant, prostate symptoms. Do not use leftover antibiotics.

Seek urgent help for inability to pass urine, severe lower abdominal pain, fever with back or side pain, vomiting, confusion, blood in urine or feeling very unwell. Emergency assessment is needed for frequent urination with intense thirst, vomiting, deep or rapid breathing, marked weakness or drowsiness, particularly in someone with diabetes.

Ask whether you need a urine test or blood glucose check, whether a medicine or caffeine could be contributing, and what symptoms would indicate infection, diabetes or a prostate problem. Share your bladder diary and current medicines.