Tea leaves can be made into tea, drinking tea can replenish the body’s need for water, but there is no cough and phlegm effect. There are many kinds of tea, tea contains caffeine, tea polyphenols, catechins and other organic compounds and a variety of vitamins, often drink tea can replenish the body’s need for water, but also supplement the body’s need for nutrients, the body’s health is favorable. Cough with phlegm is mostly seen in pathological factors, such as pneumonia, pharyngitis, bronchial asthma, bronchitis, bronchial dilatation, tuberculosis and other diseases. It is recommended not to listen to prescriptions and blindly use medication to avoid masking the condition. You can go to the respiratory medicine department of the hospital for examination to understand the causes of coughing and sputum, and then give treatment for the causes. To summarize, cough and phlegm are mostly seen in lung diseases and throat diseases, drinking tea can replenish water and nutrition, but it does not have the effect of relieving cough and resolving phlegm. Drinking tea can provide moisture and nutrients, but it does not relieve cough and phlegm. It is recommended that appropriate medication be given under the guidance of a doctor to help relieve symptoms.