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Background: 'Palpitation' is one of the most common complaints in patients referring to cardiologists. In modern medicine era, these patients suffer from much distress and some cases are known to be difficult to treat. Although the clinician's first duty is obviously to search for an organic basis for this symptom, the diagnostic evaluation is frequently unrevealing. However, clinical experience suggests that psychiatric causes are relatively common., Objectives: This research aimed to screen for mental disorders in patients complaining of palpitation and healthy persons in order to perform a preliminary comparison between them., Patients and Methods: This is a case-control study to screen mental disorders. The target population consisted of adult volunteers with benign palpitation and their matched healthy persons. They were referred during a 10-month-period to the cardiology outpatient's clinic of Mostafa Khomeini hospital in Tehran, Iran. Sampling was accidental and eventually 110 participants comprised the sample size. The measuring tool was GHQ-28 (28-item general health questionnaire) and the main variable was the questionnaire score obtained from the Likert scoring method., Results: Comparing two groups showed that the number of participants with the scores more than cut-off point in palpitation group was significantly more than healthy person group (85.4% vs. 43.6% with P < 0.001). Also the total score of GHQ-28 and scores of its subscale (somatization, anxiety, and social dysfunction) in patients complaining of palpitation were significantly more than those of the healthy participants (34.2 vs. 25.7, 8.9 vs. 6.4, 9.4 vs. 6.4, and 12.3 vs. 10.8, respectively with P < 0.001, P = 0.001, P < 0.001, and P < 0.007, respectively)., Conclusions: Palpitation is the most common symptom in psychiatric disorders such as anxiety and somatization disorders. According to the results of this study, psychiatric causes have an important role in Iranian patients complaining of palpitations (benign form). Considering this fact may lead to a more effective treatment of benign palpitations.