The reasons for feeling chest tightness and breathlessness are considered to be related to chronic bronchitis, asthma attack, coronary heart disease and other factors. 1. Chronic bronchitis: this is a chronic non-specific inflammation of the mucosa and surrounding tissues of the trachea and bronchial tubes, which can cause the patient to cough, cough up sputum, accompanied by wheezing symptoms, accompanied by the manifestation of chest tightness. 2. Asthma attack: asthma is a lung disease, mainly characterized by reversible airway obstruction, acute attack, there will be expiratory dyspnea, episodes of chest tightness, breathlessness, coughing symptoms, accompanied by rales. 4. Coronary heart disease: due to narrowing or occlusion of the coronary artery lumen, during an acute attack, angina pectoris will be caused, which will also result in chest tightness and breathlessness, especially aggravated after activities. Chest tightness and breathlessness may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.