It is not recommended to blow on the air conditioner when coughing because coughing is mostly caused by various pathogenic factors that stimulate the trachea and bronchi and induce tracheal spasm, resulting in coughing symptoms. Air conditioning, especially when blowing cold air, tends to stimulate spasm and contraction of the smooth muscles of the respiratory tract, which induces more sensitivity of the patient’s cough receptors and aggravates the symptoms of coughing. In addition, if you stay in a closed air conditioning environment for a long time, there is a large amount of dust, dust mites and germs inside the air conditioner, which can easily aggravate the patient’s airway sensitivity, especially in patients with cough variant asthma and post-cold cough, and may also aggravate the patient’s respiratory infection, thus making it difficult for the patient’s cough to heal. Long-term air conditioning can lead to discomfort such as dryness and itching of the patient’s throat, which can also stimulate the patient’s cough symptoms to worsen, so patients with coughs are advised not to use air conditioning.