Shortness of breath may be a precursor of lung disease, heart disease and other diseases. 1. Lung diseases: If there are lesions in the lungs, some lung diseases, such as tuberculosis, bronchopneumonia, chronic pneumonia, and in severe cases, lung cancer or lung abscess or silicosis, at this time, the lung function will be adversely affected, especially the elasticity of the lung tissues will be greatly weakened, and the bronchial tubes will be narrowed, and at this time, breathing will become a little difficult, especially insufficient inhalation. 2. Heart disease: many heart diseases will cause shortness of breath and palpitations (rapid heartbeat, often accompanied by panic) symptoms, generally consider organic heart disease, among them, coronary heart disease, hypertrophic obstructive heart disease and myocardial infarction is the most common, but if you suffer from heart failure and other serious heart disease, it will be due to the poor ability of the heart to supply oxygen and blood and shortness of breath. If you experience shortness of breath, you should go to the hospital for examination and treatment under the guidance of your doctor.