Clinically there is no three fastest vegetables to relieve cough and phlegm, food does not have the effect of treating the disease. There are many reasons for coughing up phlegm, such as bronchitis, bronchial asthma, and tuberculosis, etc., and it is necessary to clarify the cause of the disease to treat the cause. 1. Bronchitis: bronchitis is mainly caused by pathogenic bacteria infection, the first symptom is a dry cough, with the development of the disease will lead to the phenomenon of coughing up phlegm, you can take dextromethorphan hydrobromide tablets under the guidance of a professional physician, Pentoxyverine citrate tablets and other drugs treatment. 2. Bronchial asthma: bronchial asthma is generally referred to as asthma, the causes include genetic factors and environmental factors, etc., after the disease is likely to lead to chest tightness, dyspnea and so on. When the mucous membrane of the throat is irritated, it will cause coughing and coughing up phlegm, which needs to be improved through nebulized inhalation, using drugs such as salbutamol sulfate inhalation aerosol, terbutaline sulfate nebulized liquid. 3. Tuberculosis: Tuberculosis is mainly caused by Mycobacterium tuberculosis infection, the symptoms are coughing and coughing up sputum, night sweats and body fatigue, etc., you need to follow the doctor’s instructions to take anti-tuberculosis drugs, such as rifampicin capsules, ethambutol hydrochloride tablets and so on. In addition, there are many other causes of coughing and sputum, such as pneumonia, chronic obstructive pulmonary disease and bronchial dilatation, etc. It is recommended to go to the hospital in a timely manner and follow the doctor’s instructions for treatment.