One of the most rare medical conditions is diabetes insipidus. The immediate cause of this condition is excessive thirst and frequent passage of urine that is very diluted. The condition, diabetes insipidus is cause by a hormone deficiency in your pituitary gland, found at the base of your brain.This hormone that cause diabetes insipidus is the anti diuretic hormone. Its role is to prevent your kidney from excessive production of urine. However, there is also another cause of diabetes insipidus. Your brain may produce this hormone, but it can often happen that your kidneys not respond to this hormone. So as you see, diabetes insipidus is either cause by the lack of the anti diuretic hormone of the un normal response of your kidneys to this hormone.There are also some their causes that can lead to diabetes insipidus: a tumor of your pituitary gland. This is the gland that release the anti diuretic hormone. If you have an injury to your head that somehow damaged this gland as well, the this can also be a cause of diabetes insipidus. Brain tumors, encephalitis, meningitis are also some of the things that may cause diabetes insipidus. Kidney problems or hemorrhage in your head or pituitary gland can also be some of the cause of this type of diabetes. Unfortunately, there are no known ways that can help you prevent this diabetes type.The most common of all diabetes insipidus symptoms is excessive thirst. This is a very difficult symptoms, because this thirst can not actually be satisfied. Another diabetes sign is the passage of excessive quantities of urine, that is also very diluted and has no color. Dehydration is another sign of diabetes insipidus. This can also be more thought of as a result of this particular diabetes type. Low pressure of your blood, an increased heart rate and even shock can be the results of this diabetes symptom. If you thought that the symptoms of diabetes insipidus ended here, you thought wrong! Constipation can also be one of the diabetes insipidus symptoms together with bed wetting. However, this last sign is not that common.Because diabetes insipidus is highly related to the pituitary gland and to your brain, any tumor found in those areas can mean a risk factor in diabetes insipidus. Furthermore, any injury to the head of infection in this area can also be thought as risk factors of this diabetes type.