Coughing when exposed to cold and heat may be related to a variety of diseases, common causes include cough variant asthma, bronchitis, allergic cough. 1. Cough variant asthma: Cough variant asthma is mostly triggered by colds, cold air, dust and fumes, etc. The patient will have an irritating dry cough, and therefore will have a cough when stimulated by cold air. 2. Bronchitis: Bronchitis can be caused by allergies or physical and chemical factors, the air may be accompanied by allergens or irritating gases, the bronchial mucosa caused by the stimulation of the cough will occur in the cold and heat, may also be accompanied by coughing sputum and fever. 3. Allergic cough: Allergic cough can be caused by exposure to allergens (e.g., cold air, dust, pollen, etc.), and therefore can be associated with a cold and hot cough, which is mostly an irritating dry cough accompanied by a tickle in the throat. Coughing in the cold and heat may also be associated with other illnesses, so it is necessary to go to the hospital to clarify the cause of the illness, and under the guidance of the doctor, targeted treatment.