Hypokalemic paralysis due to renal tubular acidosis: uncommon initial manifestation of primary Sjögren´s syndrome.

Primary Sjögren´s Syndrome is an immune-mediated disease characterized by exocrine glands dysfunction due to lymphoplasmacytic infiltration with sicca symptoms being one of its main features. The disease may, however, present as distal renal tubular acidosis due to renal involvement, which can range from asymptomatic to life-threatening. We describe the case of a 33-year-old woman with hypokalemic paralysis and metabolic acidosis secondary to distal renal tubular acidosis, leading to the diagnosis of primary Sjögren´s Syndrome. Although rare, recognizing primary Sjögren´s Syndrome as a possible cause of distal renal tubular acidosis may elicit an earlier diagnosis and treatment, improving the patient´s prognosis.