Myocarditis and pneumonia belong to two different diseases, but there are both differences and connections. Myocarditis refers to an inflammatory reaction in the heart muscle, mostly caused by viral colds, common in children, and can present with symptoms such as chest tightness, panic and palpitations, which can be clarified by an electrocardiogram and myocardial enzyme profile. Pneumonia is an inflammatory infection of the lungs, which can be caused by a variety of pathogens. It often presents with symptoms such as coughing, coughing, fever, chills, and even blood in the sputum, which can improve with anti-inflammatory treatment, and often requires a chest X-ray, chest CT, and other tests to make a clear diagnosis. Although these two diseases are distinct, they can also be related. Pneumonia patients who spread can cause myocarditis, and myocarditis patients who do not receive good treatment can also develop pneumonia secondary to pneumonia. Therefore, the human body is a whole and it is important not to see only one disease and to be alert to the possibility of other diseases during the treatment process.