The fastest way to treat cough and phlegm does not exist. As there are many diseases that can cause cough and phlegm, you need to treat the cause in order to recover the fastest. Common causes include colds, lung infections, allergic rhinitis, etc., which can be treated with appropriate medications. 1. Colds: If the cough and sputum are caused by the common cold, no medication is needed for mild symptoms, and you should take care to rest and drink plenty of water during the illness. If the symptoms are more serious, you can take Ambroxol, Bromhexine and other cough and phlegm medication to treat the symptoms. 2. Lung infections: when the lungs are infected with pathogens that can lead to coughing, coughing and other discomforts, the treatment is based on anti-infection, such as cefixime, levofloxacin, etc., and secondly, with Ambroxol oral solution and other cough and phlegm, and can be given to the nebulization of acetylcysteine treatment if necessary. 3. Allergic rhinitis: mainly due to contact with allergens or irritating gases caused by nasal congestion and runny nose, nasal discharge backflow to the throat can cause coughing and phlegm symptoms, first of all, need to stay away from allergens, and secondly, can be taken to antihistamines, such as chlortetracycline, cetirizine, and other anti-allergy treatment. After the rhinitis is controlled, cough and phlegm can be relieved. Cough, cough sputum can also be seen in a variety of other causes, such as gastroesophageal reflux stimulation cough, eosinophilic bronchitis, cough variant asthma, etc., the cause of different treatments, it is recommended that patients with significant or gradually aggravating symptoms, timely medical care, to find the cause of the disease, and comply with the doctor’s instructions for medication.