Typical clinical manifestations of asthma: episodes of shortness of breath, chest congestion, phlegm in the throat, some may be accompanied by coughing and coughing up sputum, more frequent at night, which can be relieved by itself. There are also patients who do not have obvious asthma, but only have coughing as the main manifestation, often with an itchy throat, heavy cough at night, mostly dry cough, and coughing is aggravated when encountering the stimulation of oil and smoke or cold air. There are also some patients who only have the clinical manifestation of chest tightness without cough, sputum or shortness of breath, which may be chest tightness variant asthma. For the above 2 kinds of variant asthma, the diagnosis just needs to be perfected by chest X-ray and only, so that the diagnosis can be clear!