What happens if a cat drinks too much water?

Drinking too much water usually does not cause serious problems right away, but long-term heavy drinking or a sudden clear increase may relate to health issues such as diabetes, hyperthyroidism, and kidney disease. In addition, some medicines may increase thirst, such as diuretics and corticosteroids.

If a cat is on medication and drinks more, ask a vet whether it is drug-related. Finally, in hot weather or with overly salty food, a cat’s water intake also rises, which is normal, but avoid feeding too much salty food to reduce kidney strain.