Dipsesis is an unusually great thirst, or a craving for unusual drinks — the clinical term for pathological thirst. Ordinary thirst signals the body’s need for water; dipsesis describes thirst that is excessive, persistent, or directed at strange fluids, beyond what fluid balance explains. It appears in diabetes mellitus, where high blood sugar drags water into the urine; in diabetes insipidus, where the kidney cannot concentrate urine; in kidney disease; and in certain psychiatric conditions where compulsive water drinking itself becomes the disorder. Physicians take it seriously as a symptom because it points to failures in the hormonal control of water — antidiuretic hormone, thirst centres in the hypothalamus, kidney function. The word belongs to the family of thirst terms in medicine, naming the extreme end of a sensation everyone knows.