Right deviation of ECG electrical axis can be seen in physiological factors, which may appear without symptoms; it can also be seen in right ventricular hypertrophy, left posterior branch block and other diseases, and the symptoms may be shortness of breath, lower limb edema, etc., and the symptoms are different in different diseases. The range of the normal electrical axis is between -30° and +90°. An electrical axis in the range of +90° to +180° is a rightward deviation of the cardiac axis. The deviation of the electrical axis is generally influenced by factors such as cardiac anatomy and intraventricular conduction function. Physiologic rightward deviation of the electrical cardiac axis in congenital development is usually asymptomatic and does not require treatment if no abnormality of cardiac structure or function is detected after examination. Diseases such as right ventricular hypertrophy and left posterior branch block can also cause rightward deviation of the electrical axis of the heart, and some patients may have obvious symptoms, which can also be manifested as shortness of breath, coughing, dyspnea aggravated by exercise, panic, chest pain, hemoptysis, and edema of the lower limbs. It is recommended to go to the hospital in time when the above symptoms appear, so as to avoid delaying the condition.