Laryngotracheitis, or laryngotracheitis, can be caused by a variety of factors, including environmental pollution, infection by pathogenic microorganisms, and smoking. 1. Environmental pollution: some harmful gases may cause laryngotracheitis when they gradually stimulate the epithelial cells of the respiratory tract. 2. Disease-causing microorganisms infection: Infectious factors are also the main causes of tracheitis, common bacterial infections, mycoplasma infections, viral infections and fungal infections, generally more viral infections. 3. Smoking: Cigarettes contain chemicals such as nicotine and tar, which can lead to damage to airway epithelial cells and reduce the swallowing function of macrophages, which can easily trigger laryngotracheitis. Laryngotracheitis is a common respiratory disease, some cases have a certain degree of contagious, so once diagnosed, it is recommended to go to a regular hospital to receive standardized treatment.