If patients feel stuffy and uncomfortable in the chest, the following major types of diseases should be considered: 1. For patients with previous cardiac neurosis, they will have the above-mentioned conditions when there is a disorder of the vegetative nerves or when there is an endocrine disorder; 2. If patients have some endocrine or metabolic diseases, such as thyroid dysfunction and adrenocortical insufficiency, they will also have stuffiness in the chest, dyspnea, palpitations, etc. 3. For acute infections of the respiratory tract, such as acute bronchitis, pleural effusion, massive lung infection, and pleurisy, patients will also have symptoms such as chest tightness and dyspnea; 4. For cardiogenic diseases, such as coronary artery disease, unstable angina, arrhythmia, and myocarditis, they will also have the above clinical manifestations.