Diseases That Can Make You Feel Excessively Thirsty

Water is an important part of our lives and no one can live without water. Thirst is one of the powerful behavioral drives. Whenever we feel thirsty, we drink water. But there are certain times when we feel excessive thirst and fails to recognize a cause of it. In fact, mostly we tend to ignore this situation.

Although there are many causes of excessive thirst and many may not be harmful to the human body, some underlying disease can also be a cause of it. There are many diseases which have excessive thirst as its primary symptom. The stimuli to thirst are categorized into two types of drinking:

  • Primary drinking means that there is a relative or complete lack of water in the fluid spaces of the body and drinking attributes to this deficit.
  • Secondary drinking means that the relation between the need for water and drinking is less immediate and can altogether be absent.

Feeling thirsty does not necessarily indicates a sign of an underlying condition but there is a possibility of it. Some of the diseases that can make an individual feels excessively thirsty after regular intervals are as follows:

Diabetes Mellitus

Diabetes mellitus is a metabolic condition in which the body fails to process food properly and use it as an energy, as a result, it causes hyperglycemia. Hyperglycemia is a medical term which is used to describe an elevated glucose level in the blood. Hyperglycemia occurs due to defect in insulin secretion, insulin action, and both.

Normally, the pancreas is responsible for the production of insulin in the body. Insulin is the primary hormone which regulates the level of glucose in the body and ensures that the glucose reaches the body cells. Therefore, when the pancreas fails to produce sufficient amount of insulin in the body, glucose is unable to reach the body cells, as a result, the level of glucose in the body becomes high. Sometimes, pancreas successfully produces insulin but due to certain impairment, body fails to utilize produced insulin effectively.

Diabetes mellitus is accompanied by a wide range of symptoms, including excessive thirst. In fact, excessive thirst and frequent urination are the hallmark symptoms of diabetes mellitus. Excessive thirst and frequent urination are correlated. The build up of sugar in the bloodstream forces kidney to filter excessive sugar and secrete it through urine. Frequent urination makes a body dehydrated and as a result, an individual feels thirsty. 


Most often, we fail to recognize when our body is in need of hydration. Anyone can suffer from dehydration and there are many causes of it. Dehydration is basically a term which is used to describe a condition in which a body loses too much of water. In the human body, water is used for various purposes such as to breathe, to pass urine, and sweat. Our body continuously loses some amount of water in the form of sweat or urine and drinking plenty of water covers the loss of water.

When an individual fails to provide the body with an adequate amount of water, it starts to affect the body and develops the symptoms associated with it. Thirst is the primary symptom of dehydration. Dehydrated body asks for water after every interval in order to complete the loss of water and continue performing its functions.

When dehydration is left unnoticed or untreated, it can act as a risk factor for various other disorders such as urinary tract infection, kidney stones, constipation, low blood pressure, and kidney failure. Other than excessive, the symptoms of dehydration include a headache, confusion, dark urine, fatigue, and muscle cramps.   

 Also Read: Knowing Different Types Of Glaucoma


Schizophrenia is a chronic and one of the severe mental disorders that have a significant impact on the quality of life. It is not a very common disorder but it severely interferes with the ability of an individual to think, make decisions, and manage their emotions.

Schizophrenia is characterized by a variety of symptoms such as hallucinations (in which an individual sees, hear, or smell things that others can’t), delusion (in which an individual have false belief about something that can’t be changed at any cost), problems with thinking (struggling with their own thoughts and unable to remember things), and other symptoms such as lack of symptoms.

Multiple studies have suggested that there is a strong relationship between schizophrenia and polydipsia. Polydipsia is a medical term used to describe an increase in the thirst and excessive fluid intake. There is evidence that states that almost 20% of the patients having schizophrenia also experience increased thirst.  

Dry Mouth

Dry mouth, also known as xerostomia is a medical condition which is characterized by the lack of saliva. Saliva acts as a natural defense system for teethand it also plays a role in preventing the development of tooth decay. Dry mouth occurs when the salivary glands fail to function normally.

Dry mouth is considered to be a symptom of some serious disorder and dehydration is one of them. Dehydration in the mouth ranges from mild to severe and can affect an individual in different ways. As this disease develops gradually, as a result, it is left unnoticed. Increased thirst is one of the common symptoms that occurs with dry mouth but it too can be left unnoticed. Some other symptoms of dry mouth include dry lips, damaged lining inside the mouth, bad breath, difficulty swallowing, difficulty speaking, and an increased risk of tooth decay.