Above the breast is the chest, which is made up of the thorax and the heart, lungs and large blood vessels inside. If the patient feels abnormalities in this area, such as feeling chest pain and tightness, it may be a lung disease or a heart disease. Lung CT, electrocardiogram, cardiac enzyme profile, and cardiac ultrasound are recommended, and the appropriate tests are selected depending on the symptoms the patient is experiencing. For example, if the patient has cough, sputum and chest pain, it is recommended to choose lung CT need to consider lung disease. If the patient has paroxysmal precordial pain, dissipating to the left shoulder and armpit, with crushing or burning pain, it may be a manifestation of coronary heart disease, and it is recommended to do electrocardiogram, cardiac ultrasound and cardiac enzyme spectrum examination to clarify the diagnosis.