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In page Dysgeusia:

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Xerostomia, also known as dry mouth syndrome, can precipitate dysgeusia because normal salivary flow and concentration are necessary for taste. Injury to the glossopharyngeal nerve can result in dysgeusia. In addition, damage done to the pons, thalamus, and midbrain, all of which compose the gustatory pathway, can be potential factors.[1] In a case study, 22% of patients who were experiencing a bladder obstruction were also suffering from dysgeusia. Dysgeusia was eliminated in 100% of these patients once the obstruction was removed.[1] Although it is uncertain what the relationship between bladder relief and dysgeusia entails, it has been observed that the areas responsible for urinary system and taste in the pons and cerebral cortex in the brain are close in proximity.[1]