Uncontrolled diabetes can cause damage to many bodily organs and even result in death. Cases due to dehydration can usually be treated successfully without long term effects. A person with psychogenic polydipsia can sometimes develop dangerous salt imbalances due to excessive water drinking. Excessive thirst is not contagious and poses no risks to others. If the cause of excessive thirst is dehydration due to an infection, the infection may be contagious.
Treatment is directed at the cause.
For example, a person with diabetes may use insulin injections or other medications to control blood sugar levels. Someone who is dehydrated is given fluids. This is a special thin tube that is inserted through a person's skin and into a vein, usually in the hand or forearm. This may be necessary if a person if vomiting and cannot hold fluids down. Someone with hyperthyroidism may need medication, surgery, or radioactive therapy to treat the condition.