The main reasons for dizziness and polyuria are as follows: First, if the patient has dizziness and polyuria for a long time and the symptoms of dizziness progressively worsen, the patient should consider that it may be caused by a tumor in the head, an occupancy or trauma to the brain, and other factors that reduce the secretion of antidiuretic hormone. If the patient is able to drink water and is irritable at the same time, he or she should consult a neurologist and have the plasma antidiuretic hormone level measured in a timely manner, and also improve the magnetic resonance examination to clarify. The third aspect is that patients with dizziness and polyuria should also consider that it may be caused by diabetes.