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We hypothesized that treatment of adenomyosis with the levonorgestrel-releasing intrauterine system (LNG-IUS) can concurrently improve urinary incontinence along with irritative and obstructive symptoms and thus positively affect the patients' quality of life.Sixty-five patients suffering from heavy prolonged menstrual bleeding (menorrhagia) with dysmenorrhea diagnosed with uterine adenomyosis by ultrasound were enrolled in this study. LNG-IUS was inserted in the outpatient department for the treatment of the uterine adenomyosis. The patients filled out two validated questionnaires, the Urogenital Distress Inventory (UDI-6) and the Incontinence Impact Questionnaire (IIQ-7), before and 6 months after the insertion of the LNG-IUS. The before and after scores were compared using the non-parametric Mann-Whitney U test.The mean (± SD) age of the patients was 44.5 ± 6.5 years. Both UDI and IIQ scores were significantly lower at 6 months after treatment with the LNG-IUS (P0.0001). UDI scores revealed improvement rates of 14.3%, 35.7%, and 22.7% for urinary incontinence, irritative symptoms, and obstructive symptoms, respectively. Moreover, improvements in irritative and obstructive symptoms were significantly correlated with improvements in menorrhagia and dysmenorrhea (P0.04). IIQ scores demonstrated improvement rates of 18.9%, 14.6%, 19.7%, and 18.5% for physical activity, travel, social relations, and emotional health, respectively.LNG-IUS used for treating menorrhagia and dysmenorrhea improved urinary incontinence along with irritative and obstructive symptoms in patients with adenomyosis.