The causes of chest tightness in children mainly include myocarditis and severe pneumonia, as follows: 1. myocarditis: infection with intestinal viruses can cause viral myocarditis, and after the occurrence of viral myocarditis, chest tightness, panic, and even dizziness, pallor and other symptoms, which require timely nutrition of the heart muscle, such as the application of a large amount of vitamin C. 2. severe pneumonia: the occurrence of severe pneumonia can cause a large solid shadow in the lungs, which can cause chest tightness, cough more serious symptoms, and even a high fever persists, which requires timely anti-infection and phlegm treatment.