Dyspnea is medically known as dyspnea, and the causes are: first, respiratory diseases, such as foreign bodies in the trachea, acute bronchitis, asthma, inflammation of the lungs due to various bacteria and viruses, pulmonary embolism, enlarged tonsils, laryngeal edema, allergies, pneumothorax, pleural effusion, lung tumors, etc. Second, heart disease, such as acute left heart failure, pericardial effusion, pericarditis, myocarditis, severe arrhythmia, congenital heart disease. Third, consider whether there is poisoning, such as gas, carbon monoxide, organophosphorus insecticide, snake bites, etc. can appear breathing problems. Fourth, there are no neuropsychiatric reasons, such as cranial tumor, trauma, bleeding, etc. can make the respiratory center inhibited, thus appearing dyspnea symptoms, and some people quarrel, anger, menopause, neurosis, endocrine dysfunction, hyperthyroidism, severe anemia can also appear dyspnea. In short, there are many causes of dyspnea, the specific should be based on the medical history, clinical symptoms and the corresponding examination to comprehensive judgment, most people are transient, there is no clinical significance, if there is really serious disease, usually accompanied by other corresponding symptoms, then you need to go to the hospital in a timely manner.