[Primary polydipsia and eating disorders: three case reports]

We present three patients with eating disorders and primary polydipsia with different severity and clinical relevance. This association is underestimated in common clinical practice, either due to hidden symptoms or lie over the real hydric intake, or due to lack of nosology location as a differentiated entity in nowadays nosologies, or by ignorance of the clinical features it can generate. These and other similar cases published in the literature indicate the real need to make a medical history focussed on hydric intake as part of the whole medical and psychiatric story and be alert if previous positive hyponatremia is recorder. Finally we propose five recommendations for the management and praecox diagnosis in order to avoid severe clinical consequences.