<unk>  is the craving for liquids, resulting in the basic instinct of humans or animals to drink. It is an essential mechanism involved in fluid balance. It arises from a lack of fluids and/or an increase in the concentration of certain osmolytes such as salt. If the water volume of the body falls below a certain threshold, or the osmolite concentration becomes too high, the brain signals<unk> .
Continuous dehydration can cause a myriad of problems, but is most often associated with neurological problems such as seizures, and renal problems.
Excessive<unk> , known as polydipsia, along with excessive urination, known as polyuria, may be an indication of diabetes.
There are receptors and other systems in the body that detect a decreased volume or an increased osmolite concentration. They signal to the central nervous system, where central processing succeeds. Some sources therefore distinguish  "Extracellular<unk> " from "intracellular<unk> ", where extracellular<unk>  is<unk>  generated by decreased volume and intracellular<unk>  is<unk>  generated by increased osmolite concentration. Nevertheless, the craving itself is something generated from central processing in the brain, no matter how it is detected.
Thirst
Cough  
Cough
Overeating
Sneeze
Sleepeating
Anorectic
Desiccation