Everyone has had a cough, and many people think that it is just a minor ailment, that they may have caught a cold, and that they will get over it with extra clothes and medication. Cough variant asthma (CVA) is a specific type of asthma that accounts for 29% of the incidence of chronic cough. It is mainly due to the presence of airway hyperresponsiveness in patients, which causes a local hypersensitivity reaction when allergens stimulate the airways, resulting in tracheal and bronchial spasms that produce a reflex cough that can easily develop into asthma. The typical clinical manifestations of this type of patients are as follows: 1. usually an irritating dry cough, mainly at night or in the early morning, often accompanied by chest tightness, without dyspnea, usually without sputum and without fever; 2. lasting more than two weeks and often triggered by respiratory irritants such as cold air, dust, fumes and laughter, or sometimes caused by excessive fatigue or mental overstimulation; 3. having a family or personal history of allergy; 4. 4. the symptoms of asthma are more seasonal, with frequent attacks in spring and autumn; 5. treatment with general cough suppressants or antibiotics is ineffective; 6. the specific test for asthma is positive for airway reactivity. The treatment of cough variant asthma is the same as that of typical bronchial asthma. The most effective method is the combined application of glucocorticoids and inhaled β2 agonists, with most patients requiring inhaled small doses of glucocorticoids. TCM has good efficacy in treating this disease. According to the clinical characteristics, TCM identifies the deficiency of Yin and Blood in the liver, the dryness of blood generates wind, Yin deficiency and wind movement, internal wind disturbance, shaking the bell and sounding. The treatment is to soften the liver to quench the wind and purge the lung to subdue the rebellion. The formula is based on the addition of allergy decoction with medicines such as wu mei, bai shao, bai hu, fang feng, wu wei zi, hook vine, di dragon, mulberry bark, almond and roasted licorice. In some CVA patients, cough attacks or exacerbations are often related to emotional fluctuations, and in female patients, they are closely related to the menstrual cycle. The symptoms include choking cough with little phlegm, worsening in bouts, chest fullness, irritability, bitter mouth and dry throat, thin white or thin yellow coating, and string pulse. The evidence belongs to liver depression and qi reversal, wood knocking and gold sounding. The treatment is to dredge the liver and regulate qi, lower the rebellion and stop the cough. The formula is based on Xiao Chai Hu Tang combined with Yi Yao San, with medicines such as Chai Hu, Scutellaria, Qing Han Xia, Angelica, Bai Shao, Peppermint, Xiang Shen, Citrus aurantium, Sang Bai Pi, Roasted Licorice, etc. Liver depression and fire, wood and fire Xing Jin, guard the above plus Dan Pi, Gardenia, Dai Clam San to clear liver fire and resolve phlegm; fire and yin injury obviously, guard the above plus Zhi Mu, Bei Mu, Sha Shen nourish Yin and moisten the lung to stop cough. Postnasal drip syndrome refers to allergic or non-allergic rhinosinusitis, causing secretions to backflow to the postnasal and posterior pharynx, and even reflux to the vocal cords or trachea, resulting in a series of symptoms such as chronic cough and pharyngeal foreign body sensation. It accounts for nearly 20% of the incidence of chronic cough. The typical clinical manifestations of these patients are: 1. paroxysmal or persistent cough, mainly during the daytime and less after sleep; 2. most patients have postnasal secretions, oral mucus adhesion, itching in the throat, foreign body sensation or the feeling of “paste sticking to the throat”, and frequent throat clearing, which is commonly referred to as the reflux of nasal snot In layman’s terms, the backflow of nasal mucus causes discomfort in the pharynx, which naturally leads to a reflex cough; 3. The main causes of postnasal drip syndrome are seasonal allergic rhinitis, perennial non-allergic rhinitis, vasodilatory rhinitis, infectious rhinitis, fungal rhinitis, common cold, and paranasal sinusitis. Those with large amounts of sputum are mostly due to chronic sinusitis; vasodilatory rhinitis is characterized by large amounts of thin, watery nasal discharge sometimes produced with temperature changes. For cough caused by non-allergic rhinitis, vasodilatory rhinitis and common cold, first-generation antihistamines (chlorpheniramine maleate) and decongestants (pseudoephedrine hydrochloride) can be used; for cough caused by allergic rhinitis, second-generation antihistamines (loratadine, astemizole, etc.) should be used, along with intranasal spray of glucocorticoids, such as beclomethasone propionate, budesonide and mometasone furoate, etc. In Chinese medicine, most of the evidence is due to deficiency of Qi, loss of harmony between Ying and Wei, and unfavorable clearing of the orifices. The treatment is to benefit the qi and strengthen the surface, harmonize the ying and gui, and clear the pharynx and orifices. The formula is Yu Ping Feng San combined with Gui Zhi plus Hou Pu apricot seed soup plus reduction, such as Astragalus, Atractylodes, Fang Feng, Gui Zhi, Bai Shao, Hou Pu, Almond, Cicada, Xin Yi, Cang Er Zi, etc. If the patient nasal congestion, headache is obvious, guard the above plus Su Ye, Angelica dahurica, pungent warmth through; if the cough sputum thin amount of people, can be added at your discretion atractylodes, half summer, Chen Pi dry dampness and resolve phlegm; if accompanied by tiredness and weakness, cold limbs cold people, can guard the above discretion plus party ginseng, Xian Mao, Xian Ling spleen benefit qi and warm yang. If the patient has recurrent sinusitis, flowing yellow thick turbid mucus obviously, guard the above plus scutellaria, fishy grass, septoria to clear heat and detoxify dampness. Gastroesophageal reflux cough usually results from reflux of gastric acid and other gastric contents into the esophagus. It accounts for 10-20% of the incidence of chronic cough. The typical clinical manifestations of these patients are: 1. a burning sensation behind the sternum, which is usually referred to as heartburn symptoms, accompanied by acid reflux, belching, chest tightness, and the appearance of some atypical symptoms, such as chronic cough, asthma, and hoarseness; 2. the cough mostly occurs during the day and in the upright position; 3. the cough is mostly dry and lasts for a long time; 4. in mild cases, a small amount of white mucous sputum is coughed, and in severe cases, dyspnea, pus sputum, The cough is often associated with food intake and is aggravated by the consumption of high-fat foods and coffee. Treatment for these patients should start with lifestyle adjustments. Obese people should preferably lose weight, avoid overeating in general, eat less and more often, avoid eating before bedtime, eat less acidic and greasy food, drink less coffee and other beverages, and also quit smoking. From the perspective of Chinese medicine, the cause and mechanism of the disease are due to prolonged gastric disease, soil congestion and wood depression, acid production from wood gas, disharmony of liver and stomach, imbalance of qi elevation and declination, and coughing from lung gas upward; analyzing the location and transmission pattern of the disease, it originates in the stomach, involves the liver, and then spreads to the lung. The evidence is that the liver and stomach are not in harmony and the lung is not purified. Therefore, the treatment of this disease should take the lung as the target and the liver and stomach as the root; stopping the cough is the target and lowering the rebellion is the root. The method is to dredge the liver, harmonize the stomach and control acid, and purify the lung to lower the rebellion and stop cough. The formula is based on the combination of Zuojin Wan with Zhuangyu Dianchu Tang, with the addition and subtraction of medicines such as Chai Hu, Bai Shao, Huang Lian, Wu Ju Ju, Zhuangyu Hua, Dianchu Shi, Hou Pu, Yu Jin, Citrus Aurantium, Su Zi, and Roasted loosestrife. In addition to the above-mentioned types of cough, there are many other causes of cough, such as post-infectious cough, allergic cough, drug-induced cough, and so on. Etiological diagnosis is the key to the diagnosis and treatment of chronic cough. Its diagnosis should emphasize the medical history, and relevant tests should be selected based on the medical history, with the tests progressing from simple to complex, with common diseases first, followed by rare diseases, to reduce the diagnostic cost for patients. Both diagnosis and treatment should be carried out simultaneously or sequentially. Combined Chinese and Western medicine treatment is the best choice for patients with chronic cough.