Shortness of breath means shortness of breath, a feeling of breathlessness and shortness of breath. There are many causes of shortness of breath, which can be divided into two categories: physiological and organic. Physiological shortness of breath is a transient shortness of breath, the general condition of the patient is fine, no underlying disease, generally do not need special treatment. The causes of physiological shortness of breath are: 1. Inhibition of the nerve center. If a large amount of carbon dioxide in the lungs, stimulating the inspiratory center to deepen inspiration, can appear; 2, long-term fixed in a position, buried in work, will appear shortness of breath; 3, obese patients, sometimes appear shortness of breath; 4, depressed patients, long-term depressed mood, sometimes appear shortness of breath. Organic shortness of breath: that is, the patient itself combined with certain underlying diseases, because the disease itself appears related symptoms, need to actively symptomatic treatment, deal with the original disease. The causes of organic shortness of breath are: 1, lung diseases: such as chronic bronchitis, chronic obstructive pulmonary patients, lung function is impaired, shortness of breath symptoms will appear after activity. 2, heart disease: such as heart failure, pulmonary heart disease, coronary heart disease patients, may appear activity palpitations, shortness of breath discomfort. 3, chronic diseases: such as advanced cancer, anemia, renal failure and other systemic diseases, also appear shortness of breath symptoms. There are many causes of shortness of breath. For those with mild symptoms, patients may be advised to follow up and observe, while those with more severe symptoms are advised to come to the hospital immediately for treatment.