Alarmist scenario: Type 2 diabetes.
More likely cause: Your body is telling you to drink more water. If you exercise frequently, you need extra fluid to make up for what you lose through sweat. Dry, overheated air and some medications, including diuretics, can also make you unusually thirsty.
Reality check: “Unless you're thirsty all the time and you urinate frequently, increased thirst doesn’t necessarily suggest diabetes,” says endocrinologist Larry Deeb, the medical director of the Diabetes Center at Tallahassee Memorial HealthCare, in Florida. Other symptoms of type 2 diabetes include extreme hunger, unusual weight loss, fatigue, irritability, and blurry vision.
Rx: Keep a “water log” for a few weeks to track how much you’re drinking, then consult your doctor. Diabetes can be diagnosed with a simple urine or blood test.