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Causes Of Excessive Thirst In Children

By on July 14, 2010

Excessive Thirst In ChildrenExcessive thirst is also referred to as polydipsia. It is a common complaint of many children and occurs due to different reasons. Excessive thirst in children should not be ignored because it can be a symptom of a serious illness or an underlying disorder. Some major causes of excessive thirst in children are discussed below.

Diabetes Insipidus

It is a health condition in which the sufferer has frequent urination. This leads to loss of excessive fluids from their body and causes excessive thirst in children. Excessive thirst in children is commonly caused by detrimental blood sugar levels, which may be a warning sign of diabetes. The parents should consider this sign seriously and consult their doctor for their child’s check up.

Diabetes Mellitus

Diabetes Mellitus

Diabetes is one of the most widespread causes of excessive thirst in children. Diabetes mellitus includes symptoms such as excessive urination, excessive thirst and excessive hunger. Since it is seen in children, it is also known as juvenile diabetes.

Congestive Heart Failure

Some children have such a weak heart that it is unable to pump blood and oxygen required by the body tissues. This causes less volume of blood in the body which ultimately results in excessive thirst.


Dehydration is another common cause of excessive thirst in children. It is a condition in which excessive fluids are lost from the body.


Some of the common causes that result in dehydration in children are viral infection that causes high fever, diarrhea and vomiting. Parasitic and bacterial infections in children too result in dehydration.

Kidney Disease

Some children drink excess water but do not urinate in proportion to water consumption. Such children may be afflicted with an infection or kidney disease. Kidneys are responsible for the regulation of the fluid in body and also prevent dehydration. But if the kidneys fail to perform their functions effectively then excessive thirst can result in children.


Excessive thirst in children may also be caused as a side effect of certain medications such as antihistamines and cold medicines.


If your child consumes any of these medicines, you must check their labels to find out whether excessive thirst is its possible side effect or not and then meet your pediatrician.

Other Causes

Some other causes of excessive thirst in children are excessive sweating, consumption of spicy foods, liver disease and mental illness such as schizophrenia.