If the cough is paroxysmal dry cough, antibiotics are ineffective, accompanied by itchy throat, no fever, fear of cold air and smoke, and aggravation at night, if there is no abnormality in CT or X-ray examination, it is probably allergic cough, also known as cough variant asthma or allergic bronchitis.

If dry cough is accompanied by symptoms of allergic rhinitis such as rubbing nose, rubbing eyes, sneezing, runny nose and stuffy nose, it may be allergic cough caused by allergic rhinitis, also called allergic rhinobronchitis.

Suggestion: the lung fails to descend-this type is common in the early stage of post-infection cough, and it is more frequent every year than in autumn. Covering the lungs is delicate and dirty, like moistening but hate dryness, like clearing but not cold and heat. In autumn, dryness invades the lung system, affecting the function of lung propaganda and descending, and burning lung fluid, which is the syndrome. The clinical manifestation is dry cough without phlegm or with little phlegm but sticky, accompanied by dry throat, itchy throat and dry nose. Moisten dryness and relieve cough. The prescription is modified Sangxing Decoction, and the medicines are: mulberry leaf, mulberry bark, almond, adenophora root, roasted loquat leaf, Fritillaria, Gardenia, lobster sauce, mint, reed rhizome, etc. If the patient has prominent symptoms such as nasal congestion, wind aversion and itchy throat, perilla leaf, cicada slough, white muscardine silkworm, etc. Expelling wind, dispersing lung qi and relieving cough can be added as appropriate.