The most common causes of sputum in the trachea are colds, acute tracheitis and bronchitis, chronic bronchitis, chronic obstructive pulmonary disease, bronchiectasis, and interstitial lung disease, etc. Sputum in the trachea can be seen in all of the above respiratory diseases. If the sputum in the trachea is an acute respiratory disease, it is mostly caused by viral, bacterial, or atypical pathogenic microbial infections such as mycoplasma and chlamydia. If it is caused by a viral infection, it will mostly be treated with antiviral drugs, or with TCM herbs to identify the symptoms. If it is caused by bacterial infection, antibiotic anti-infection treatment can be given, commonly used penicillin amoxicillin, cephalosporin cefuroxime, macrolide azithromycin and so on. If it is caused by atypical pathogen infection such as mycoplasma, chlamydia, etc., macrolide azithromycin, etc. is usually used. In the case of adults older than 18 years of age, quinolone antibiotics such as moxifloxacin may also be used. If it is a chronic respiratory disease, it can be treated with TCM herbal medicine to identify the symptoms. If it is coughing and coughing up yellow sticky phlegm, identified as phlegm-heat internalization, lung-clearing and phlegm-reducing medicines can be given, such as Compound Fresh Bamboo Leech Liquid. If the phlegm is white, accompanied by loss of appetite and loose stools, the cough is characterized by phlegm and turbidity, and can be treated with Er Chen Wan. If the cough and phlegm are of the yin deficiency and lung dryness type, Lily Solid Gold Oral Liquid can be given to nourish yin and moisten the lungs. The common symptoms of this type of cough and sputum are cough, sputum is relatively small, or sputum with a little blood, accompanied by symptoms such as heartburn, hot flashes, night sweats, and so on.