The main causes of occasional chest tightness and shortness of breath can be divided into physiological causes and pathological causes, which require systematic examination to make a clear diagnosis, and choose the treatment plan according to the cause. 1. Physiological causes: If you are affected by environmental factors or are emotionally agitated, the symptoms of occasional chest tightness and shortness of breath are usually easily induced. Generally, after changing the environment and regulating the emotions, the symptoms will be relieved on their own, and the duration is relatively short, and will not be accompanied by other obvious abnormal symptoms. 2. Pathological causes: occasional chest tightness and shortness of breath, if the frequency of episodes is relatively high, do not rule out the existence of cardiovascular, digestive or respiratory diseases, such as bronchitis, asthma, pulmonary obstruction, myocardial ischemia, coronary heart disease and gastrointestinal flatulence and so on. If the symptoms worsen progressively, accompanied by other abnormal manifestations, such as breathlessness, headache, dizziness, etc., you need to consult a doctor for examination and targeted treatment to prevent further aggravation of the condition in the later stage.