Bronchitis is not usually hereditary. Bronchitis may be caused by pathogenic infections, physical factors, and immune factors. 1. Bronchitis may be caused by pathogen infection such as bacteria, virus, mycoplasma, chlamydia and so on. In addition, patients inhaling dust, pollen, animal hair, fungal spores, irritating gases, smoke, cold air may also stimulate the bronchial mucosa to appear inflammatory reaction. 2. Patients should pay attention to keep warm, avoid getting cold, and should not smoke. If the patient is in a more polluted environment, he/she needs to wear a mask to prevent inhaling harmful or irritating gases. Although bronchitis is not hereditary, but patients with bronchitis need to consult a doctor in a timely manner, the doctor will choose the appropriate measures for the patient’s condition treatment.