Objective  To determine the prevalence of bladder symptoms in patients with Graves’ disease and assess their abnormalities on urodynamic studies. Patients and methods  The study comprised 30 consecutive patients (13 female, 17 male, mean age 31 years, sd 10) with active Graves’ disease. Before and after attaining euthyroidism with carbimazole, their bladder symptoms were assessed using a questionnaire adapted from the American Urologic Association voiding symptom score, the serum levels of total triiodo‐l‐thyronine (T3), serum thyroxine (T4) and thyroid‐stimulating hormone (TSH) were measured by radioimmunoassay, and uroflowmetry, cystometry and perineal muscle electromyography were performed. Results  Twelve of the 30 patients (40%) had the onset of bladder symptoms 1–6 months after the onset of symptoms of Graves’ disease; four of the 12 patients had enuresis. Urodynamic studies were possible in five patients and showed reduced flow rates in all, a significant post‐void residual volume in four, and enlarged bladder capacity and increased perineal muscle electromyographic activity during the voiding phase in three. Voiding disturbances and urodynamic abnormalities resolved after attaining euthyroidism. Conclusion  Significant bladder symptoms can occur in about 40% of patients with active Graves’ disease but resolve on euthyroidism; in some patients, urodynamic studies show significant abnormalities which are also reversible.

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