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Polydipsia: 6 Medical Causes of Excessive Thirst

2. Diabetes

An unquenchable thirst is considered to be one of the earliest symptoms of diabetes. In speaking with Prevention, Heather Rosen, MD, medical director of UPMC Urgent Care North Huntingdon in Pennsylvania, explains that it occurs because diabetes causes a buildup of blood sugar in the body, which then “peer-pressures your kidneys into producing more urine to get rid of the excess glucose.” To prevent the constant fluid loss caused by frequent urination from leading to dehydration, the body will trigger thirst.

If excessive thirst is accompanied by other symptoms such as unexplained weight loss, fatigue or irritability, the source says to visit your physician for a blood glucose test to determine if you have diabetes.

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