Excessive thirst and kidney disease

Healthy kidneys balance water and minerals and concentrate urine when the body needs to conserve fluid. Reduced kidney function can disturb this balance. Some people pass urine more often, including at night, and then feel thirsty; others retain fluid and develop swelling rather than marked thirst. Thirst alone cannot show whether kidney disease is present.

Diabetes can affect the kidneys and can also cause thirst when extra glucose draws water into urine. A clinician may ask about urination, swelling, blood pressure, medicines and family history, then check blood and urine for kidney function and other causes.

Record when thirst began, how often you urinate, whether urine is unusually dark or plentiful, and any vomiting, diarrhoea, fever or heavy sweating. Drink to thirst unless a clinician has given you a fluid limit. Avoid trying to correct the symptom with excessive water, especially if you have known kidney or heart problems. Arrange a medical review if thirst persists, keeps waking you, or comes with weight change, fatigue or swelling.

Seek urgent care for confusion, fainting, severe weakness, inability to keep fluids down, very little urine, breathing difficulty or rapidly worsening swelling. Heat exposure with headache, dizziness or altered behaviour also needs prompt attention. Severe dehydration may require supervised treatment such as IV Fluid Therapy.

Could my medicines or blood sugar be contributing to thirst? Should I have kidney blood and urine tests? Do I need advice about daily fluids or salt? Which changes in urine, swelling or breathing should prompt urgent review?