Increased water intake (polydipsia) in cats is a key clinical sign of several serious underlying conditions. Recognising and investigating polydipsia early is critical for feline welfare and disease management.
Polydipsia is a welfare-significant sign because the underlying conditions causing it — kidney disease, hyperthyroidism, diabetes — cause cumulative suffering if undetected. Cats are stoic and mask illness, making polydipsia one of the few visible owner-detectable signs of systemic disease. Owners must be educated to notice increased water consumption and litter tray frequency as warning signs requiring prompt veterinary assessment. Blood and urine testing can identify most causes within a single diagnostic visit. Early-stage CKD managed with phosphorus restriction and fluids dramatically improves long-term welfare. Hyperthyroidism is readily treatable with medication, radioiodine, or surgery. Diabetes in cats can enter remission with early dietary management. Delayed diagnosis leads to more advanced disease, greater suffering, and shortened lifespan — making recognition of polydipsia a genuine welfare intervention.