After working out or spending time in the hot sun, it’s normal to be thirsty. If you eat salty or spicy foods, your thirst may seem unquenchable. But what about when you’re unusually thirsty – when no matter how much you drink, it’s just not enough? Should you be worried?
Common causes
Some common causes for extreme thirst – or polydipsia – are:
Water and salt loss. This may be from sweating, diarrhea, vomiting or lack of water.
Certain medications.
Too much alcohol, caffeine or salt.
Possible medical conditions
Your thirst may be a sign of something more serious. You could have one of many conditions, including the following:
Hyperglycemia (high blood sugar)
Diabetes
Diabetes insipidus (an imbalance in the body’s water level)
A kidney disorder (such as Fanconi’s syndrome)
Dehydration
An endocrine disorder (such as Cushing’s disease or an overactive thyroid gland)
Liver disease (such as hepatitis or cirrhosis)
A bleeding disorder (such as heavy menstrual bleeding or intestinal bleeding)
Burns or an infection
A urinary tract infection
Drug abuse
A head injury
A psychological disorder (Schizophrenia or obsessive compulsive disorder may cause compulsive water drinking.)
Too much calcium or sodium in your blood
Medications
Certain drugs can make you thirsty. These include:
Diuretics. Used to treat high blood pressure, diabetes and heart failure. Also used for swelling and diabetes insipidus. They help increase urination and decrease body fluids.
Asthma medications. Used to treat breathing problems, cramps, nausea and motion sickness.
Demeclocycline. Treats bacterial infections and lowers sodium levels.
Lithium. Treats bipolar disorder and other mental health problems.
Phenothiazines. Used to treat schizophrenia and other mental health problems.
Call you doctor if:
Your thirst is constant and unexplained
You have other unexplained symptoms, like blurred vision or fatigue
You are passing more than 5 quarts of urine a day
