Tightness of breath generally refers to chest tightness, shortness of breath, or dyspnea and other symptoms, often suggesting heart or lung disease. 1. Heart disease: heart failure, myocarditis, pericardial effusion, coronary artery disease, etc. can lead to chest tightness, shortness of breath, dyspnea, and even can not lie down and other symptoms, but also corresponding to the emergence of edema, fever, heart sound remote and other symptoms and signs. 2. Lung disease: common in bronchial asthma, acute and chronic bronchitis, pleural effusion, pleurisy, respiratory failure, etc., can lead to tightness of the symptoms, often accompanied by coughing, coughing up sputum, dry and wet rales in the lungs and other symptoms or signs. Therefore, if tightness occurs, it is important to combine the symptoms with the medical history and other symptoms, and it is recommended to consult a doctor in a timely manner.