Cough with phlegm in the elderly may be caused by bad habits, chronic bronchitis, bronchial dilatation, etc. There is no most effective way, but it can be treated by quitting bad habits, taking medication and other methods. 1. Bad habits: Older people who like to eat tobacco, alcohol or spicy stimulating food for a long time may lead to an increase in secretions in the throat and coughing with phlegm. Patients can quit smoking and drinking and eat a light diet to alleviate the symptoms. 2. Chronic bronchitis: If the elderly long-term smoking or exposure to occupational dust and chemical substances, can cause chronic bronchitis, mainly manifested as coughing, coughing up phlegm, severe wheezing symptoms. It can be treated with oral cough and phlegm medication, such as acetylcysteine. Acute exacerbation can be given azithromycin and other antibiotic treatment. 3. Bronchodilatation: Due to bronchodilatation, the secretion in the airway increases, the airway contouring is impaired, and sputum accumulation occurs, resulting in coughing with sputum. Patients can be treated with sputum promoter drugs, such as carbocysteine tablets and myrtle oil capsules. In addition to the above, there are other causes of cough with phlegm in the elderly, it is recommended to consult a doctor in time to identify the cause of the disease, and then follow the doctor’s instructions to use medication. The above drugs should be used under the guidance of a doctor, and should not be used privately to avoid adverse reactions.