There are several reasons for frequent coughing: first, coughing caused by inhalation of dust mites, pollen, fungi, and some chemicals such as sulfuric acid. Second, infections can often cause coughing symptoms, such as infections by bacteria, viruses, mycoplasma, etc. Patients with epithelial infections, upper respiratory tract infections, pneumonia, tuberculosis, and tumors often have coughing symptoms. Thirdly, the incidence is higher when the climate changes, temperature, air pressure and the seasons change. Fourth, when exercising, strong exercise-induced cough.