<unk>  (1886), by William-Adolphe Bouguereau<unk>  is the craving for potable fluids, resulting in the basic instinct of animals to drink. It is an essential mechanism involved in fluid balance. It arises from a lack of fluids or an increase in the concentration of certain osmolites, such as sodium. If the water volume of the body falls below a certain threshold or the osmolite concentration becomes too high, structures in the brain detect changes in blood constituents and signal<unk> . Continuous dehydration can cause acute and chronic diseases, but is most often associated with renal and neurological disorders. Excessive<unk> , called polydipsia, along with excessive urination, known as polyuria, may be an indication of diabetes mellitus or diabetes insipidus. There are receptors and other systems in the body that detect a decreased volume or an increased osmolite concentration. Some sources 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.
Thirst
Food craving
Cough
Overeating
Sniffing 
Phlegm
Bad breath
Sneeze