Objective: The case report presents a 30-year-old obese patient with a history of paranoidal schizophrenia, sinus tachycardia and hypertension which was admitted to the Department of Internal Medicine and Hypertension after fainting the day before. In the admission the patient suffers from a chest pain, dizziness, and abdominal pain. The physical examination revealed: BP 161/104mmHg, HR 120/min, SatO2 94%, overdeveloped fatty tissue and pain in the left chest and abdominal area after a collapse. Laboratory tests showed increased inflammation and cardiac parameters as well as extremely high concentration of TCAs (Tricyclic antidepressants). The ECG and ECHO were carried out, the former showed ST elevations in ECG leads II, III, aVF, V4-V6, the latter reveled dilation of the right ventricle, left ventricular hypertrophy and lower ejection fraction, EF = 48%. Hypotensive treatment was implemented resulting lowering blood pressure. However, the patient's condition did not get better. Stabbing and burning chest pain persisted. Considering a clinical picture, contrast-MRI was performed showing LGE (late gadolinium enhancement) on the lateral-inferior part of the left ventricle wall characteristic for myocarditis (MC). The objective of this case report is to highlight a possibility of myocarditis when there are symptoms responding to other heart diseases, atypical for MC and the role of detailed diagnostic process and holistic perspective. Design and method: Case report presentation of the patient admitted to the hospital due to the collapse episode the day before. Symptoms and additional test analysis and making the final diagnosis. Results: Initial diagnostic tests were negative or inconclusive until heart contrast-MRI was performed revealing - LGE foci in the left ventricle wall corresponding to the area of inflammatory lesion of the lateral-inferior part of the left ventricle wall. Conclusions: Although, myocarditis is a rare finding, more frequent in younger population, it is associated with significant complications and mortality thus early diagnosis can prevent critical condition. In presented case, the difficulty in making a final diagnosis of myocarditis was affected by predominant cardiac attack symptoms. Moreover, MC could be caused by TCA which high concentration was found in the patient's blood.