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Background: Somatic symptom disorder (SSD) is common in medical settings but has been underdiagnosed. Stigma related to psychiatric illness was one of the barriers to making the diagnosis. More and more SSD patients who visited psychiatric clinics with physical complaints identify themselves as having 'autonomic dysregulation' in Taiwan. Aims: This study aimed to investigate the characteristics of patients with a subjective diagnosis of 'autonomic dysregulation'. Method: We assessed the sociodemographic profile, medical/psychiatric diagnoses, subjective psychiatric diagnoses, perceived psychiatric stigma, help-seeking attitude, and healthcare utilization of 122 participants with SSD. Participants who identified themselves as having 'autonomic dysregulation' (n = 84) were compared to those who did not (n=38). Results: Participants with a subjective diagnosis of 'autonomic dysregulation' were younger and had a higher education level than those who did not have such a subjective diagnosis. They also had higher scores on the Patient Health Questionnaire-15 (PHQ-15) and Health Anxiety Questionnaire (HAQ), whereas comorbid psychiatric diagnoses were similar in the two groups. Participants with and without a subjective diagnosis of 'autonomic dysregulation' did not have a significant difference in perceived psychiatric stigma and help-seeking attitude/behaviors. In a multiple logistic regression model, only age was associated with having a subjective diagnosis of 'autonomic dysregulation'. Conclusion: Among SSD patients, those who identify themselves as having 'autonomic dysregulation' tend to have higher somatic distress and health anxiety than those who do not. 'Autonomic dysregulation' is not associated with perceived psychiatric stigma. [ABSTRACT FROM AUTHOR]