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This article is written from a secondary care perspective. In thirty years of primary care, I have seen perhaps two or three new patients with polyuria and polydipsia per year. While it is clearly crucial to test the urine for glucose to exclude diabetes mellitus as a cause for the polyuria, most patients turn out to have primary polydipsia. This is simply the habit, built up over time, of drinking large amounts of water.The belief that this is healthy is common, and so is the habit. Simple advice and explanation that reducing fluid intakes over a number of weeks is required, and suffices in most cases.
Will we miss the vanishingly rare case of diabetes insipidus? Clearly instruction to return if the problem does not settle should be given. The index case in your article is described as having frequent nocturia. This is is not the case in primary polydipsia, and should rightly trigger further investigation along the lines advocated by the authors