Why do always feel thirsty?

Online Answer
One of the most common causes of excessive thirst is having too much sugar in your blood. When your kidneys get maxed out from filtering sugar from your blood, the glucose overflow goes into your urine, taking fluids from your tissues with it. This makes you pee more, and your body dehydrates, making you thirsty.
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A lack of thirst, especially if it lasts longer than a day, or an abrupt change in your normal pattern of thirst can be a symptom of a number of conditions. A lack of thirst can indicate head injuries, liver disease, specific types of cancer, or stroke..
One of the most common causes of excessive thirst is having too much sugar in your blood. When your kidneys get maxed out from filtering sugar from your blood, the glucose overflow goes into your urine, taking fluids from your tissues with it. This makes you pee more, and your body dehydrates, making you thirsty.
Molecular structure of vasopressin. This hormone is related to Type A and Type B adipsia. Adipsia, also known as hypodipsia, is a symptom of inappropriately decreased or absent feelings of thirst..
Thirst is normally just the brain's way of warning that you're dehydrated because you're not drinking enough fluid. But excessive and persistent thirst (known as polydipsia) could be a sign of an underlying problem such as diabetes.