Systemic inflammatory diseases are characterized by multivisceral involvement at some point in their evolution.This involvement can concern almost all organs, including the heart. Each systemic condition has a unique cardiac expression. The target of this study is to determine the frequency of cardiac involvement in systemic inflammatory diseases. This study is a cross-sectional, descriptive, and analytical study that was conducted within 07 months. The aim was to screen 23 patients followed for systemic inflammatory diseases for cardiac involvement. The mean age was 44 (±12) years old with a minimum of 24 and a maximum 64 years. Most of patients were women with a sex ratio (M/F) of 0.09. An echocardiographic abnormality was found in 26.1% of patients and 73.1% had an ECG abnormality. They included left atrial hypertrophy (43.4%), left ventricular hypertrophy (30.4%), right axial deviation (26.1%), low voltage (21.7%), right atrial hypertrophy (8.6%), S1Q3 appearance (8, 6%), pulmonary hypertension (8.6%), repolarization disorders (8.6%), sinus tachycardia (8.6%), middle tricuspid insufficiency (4.3%), middle pulmonary insufficiency (4.3%), and pericarditis (4.3%). Patients with systemic inflammatory diseases had cardiac disorders with rare clinical manifestations but with an incidental discovery either on ECG or on cardiac echodoppler. Hence, a systematic cardiac exploration in these patients was essential.