Phlegm in the trachea and throat may be caused by bronchitis, colds, acute pharyngitis and other factors, which can be improved by nebulizing inhalation as well as taking medication according to the cause. 1. Bronchitis: Bronchitis is usually caused by pathogen infection, after the pathogen invades the trachea, it will cause the epithelial mucous membrane cells to secrete a large amount of tissue fluid and plasma, resulting in phlegm in the patient’s trachea and throat, and the symptoms can be improved by nebulized inhalation, and the medications that can be used include budesonide suspension for inhalation and acetylcysteine. 2. Cold and flu: when the virus invades the bronchial tubes and throat, the mucous membrane is stimulated by inflammation, the local mucous membrane will become congested and edematous, leading to an increase in secretion, so there will be phlegm in the trachea and throat, which can be treated by taking cold and flu granules and seasonal cold and flu tablets under the guidance of a doctor, supplemented by expectorant drugs such as aminobromine hydrochloride to treat the symptom. 3. Acute pharyngitis: Acute pharyngitis is an infection of the upper respiratory tract, which will cause the mucous membrane of the pharynx and trachea to secrete more mucus and phlegm, and can be treated with pharyngitis tablets and levofloxacin hydrochloride tablets under the guidance of a doctor. In addition, bronchial dilatation, pneumonia, etc. may also lead to phlegm in the trachea and throat, patients can go to the hospital to do a comprehensive examination, and then cooperate with the doctor for treatment, for example, patients with pneumonia, can be treated by intravenous drip, the use of drugs are usually injectable amoxicillin sodium, injectable ceftriaxone sodium, etc., and at the same time supplemented with percussion, the use of aminoglossum and other expectorant medicines, humidification of the airway to promote the discharge of sputum. It is recommended that patients who have more sputum, combined with other discomforts such as cough, chest pain, fever, etc., should consult a doctor in time to improve the relevant laboratory tests to assess the condition and clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.