Myocarditis is the inflammation of the heart muscle and pericarditis is the inflammation of the lining outside the heart. In both cases, the body's immune system is causing inflammation in response to an infection or some other trigger. While myocarditis can be serious, it is frequently mild and self-limited. Symptoms can include abnormal heart rhythms, shortness of breath, or chest pain. 我儿子打完第一针第二天深呼吸是有chest pain,后来好一些几乎感觉不到，今天跑了一下又有些疼。这个inflammation of heart muscles and the lining outside the heart 到底是疼还是不舒服？和胸隔膜疼有什么区别？多谢。