Foods do not usually have the exact effect of relieving cough and phlegm and need to be treated with medication, but a sensible diet may be helpful in recovering from cough and phlegm symptoms. Foods generally have no medicinal value, so they do not have a therapeutic effect on cough and phlegm sufferers and may delay the recovery of the condition. However, food can provide the body with the nutrients it contains, which can promote the recovery of the disease. Cough, phlegm patients need to eat a light diet, avoid spicy, and appropriate intake of high quality protein such as eggs, milk, rich in vitamins such as fresh fruits and vegetables and other foods. Cough, cough sputum can be caused by a variety of diseases, such as upper respiratory tract infections, bronchitis, bronchopneumonia, bronchiectasis, cough variant asthma, pharyngitis, etc., need to identify the cause of the disease, and for the cause of the treatment, in order to effectively relieve the symptoms. If the cough and sputum symptoms do not improve repeatedly, it is recommended to consult a doctor in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.