Cough and phlegm remedies lack a certain scientific basis. There are many reasons for coughing up phlegm, common such as chronic obstructive pulmonary disease, bronchitis, tuberculosis, etc., need to treat the cause of the disease, if necessary, symptomatic treatment. Many diseases can cause cough with phlegm, including viral infections, bacterial infections, fungal infections, tuberculosis, malignant tumors, etc. In this case, the use of small remedies can not be treated from the root, can not be completely cured, but may cover up the condition, or bring other hazards, it is not recommended to use. Cough and phlegm need to be treated according to the cause, such as bacterial infection can be treated with sensitive antibiotics; fungal infection can be treated with fluconazole, voriconazole, etc.; for tuberculosis can be treated with isoniazid, rifampicin, etc.; malignant tumors can be treated with surgery, radiotherapy and chemotherapy. When the symptoms are obvious, it can be treated with symptomatic treatment such as dextromethorphan to relieve cough and resolve phlegm. Cough with phlegm should go to the hospital in time to find out the cause of the treatment, do not recommend the use of small remedies to avoid delaying the condition, if you need to use medication, you should strictly comply with the doctor’s instructions.