If the urine output exceeds 2500 mL in 24 hours, this condition is called polyuria. There are many causes of polyuria; diabetes is just one of them. Additionally, physiological causes are also seen, such as eating a large amount of fruits that have a diuretic effect, like watermelon, or drinking a lot of water previously. This is referred to as physiological polyuria and does not require special treatment. Pathological causes, apart from diabetes, also include diabetes insipidus or electrolyte disturbances. For instance, long-term hypokalemia, hypercalcemia, or increased aldosterone can all lead to polyuria. It is advisable to promptly visit the urology department of a hospital for tests such as blood glucose levels, routine urine tests, and endocrine examinations to understand the causes of polyuria, and to determine whether it is caused by diabetes.