Why Is My Cat Drinking So Much Water

This page is educational reference material for preparing questions. A licensed veterinarian examines the animal, makes the diagnosis, and sets the treatment.

Excessive thirst in cats (polydipsia): kidney disease, diabetes, hyperthyroidism, and liver disease. Always needs veterinary testing.

Understanding This Symptom

As a cat owner, noticing changes in your pet's behavior or health is the first step to getting them the help they need. This page covers the most common causes, warning signs that indicate an emergency, and what you can expect at the veterinarian.

Common Causes

Less Serious Causes

More Serious Causes

• Poisoning or toxic exposure

What to Watch For

• Lethargy or reluctance to move or play
• Vomiting, diarrhea, or changes in stool

Home Care and First Steps

Veterinary Diagnosis

Your veterinarian will typically:

• Perform a thorough physical examination

Treatment Options

Prevention

Long-Term Management

When to Get a Second Opinion

Related Symptom Guides

• Why Is My Cat Not Eating?
• Why Is My Cat Vomiting?
• Why Is My Cat Hiding?
• Why Is My Cat Sneezing?
• Why Is My Cat Losing Weight?

Should I go to the emergency vet?

Extra drinking plus vomiting, hiding, or a male cat straining in the box needs the same-day clinic. A cat that has been at the bowl more for several days and is still eating should be seen this week. Diabetes, kidney disease, and hyperthyroidism are the common reasons.

How much will treatment cost?

Bring a urine sample if you can catch one. The visit usually adds bloodwork with a kidney value, glucose, and a thyroid level in an older cat. Urine culture and blood pressure are the next costs if the first tests are abnormal.

Can I treat this at home?

Measure the bowl from morning to morning and write the change down. Do not take the water away. A cat on a dry-only diet that suddenly empties the bowl has a medical question, even if the coat still looks fine.