The main causes of chest tightness in children include the following conditions. The first is caused by pneumonia in children, which can cause inflammatory lesions in the lungs, resulting in lack of oxygen in the lungs, which can lead to faster breathing, chest tightness and other symptoms. Secondly, chest tightness is caused by myocarditis in children. When children suffer from myocarditis, it can also cause chest tightness, panic, weakness and a series of other symptoms, and at this time, children can be diagnosed with cardiac enzyme profile and troponin.