Q waves are a manifestation of the electrocardiogram, and abnormal Q waves can occur in many cases. The abnormal Q waves are mainly related to several factors: 1, septal hypertrophy; 2, myocardial ischemia, especially after acute myocardial infarction, Q waves can appear; 3, myocarditis after causing myocardial necrosis and fibrosis, Q waves can appear; 4, some normal people can still show abnormal Q waves on ECG although they do not have organic heart disease. Therefore, the most critical thing to deal with Q waves is to make a differential diagnosis. ECG, dynamic ECG, cardiac ultrasound, and even cardiac MRI can be done. If there is no underlying disease, abnormal Q waves can be treated without treatment. If there is a corresponding disease, such as cardiomyopathy or myocardial ischemia, comprehensive treatment should be given for myocardial ischemia or cardiomyopathy. Even if the abnormal Q waves are caused by organic heart disease, the prognosis is very good after standard treatment.