Symptoms such as coughing up phlegm after 5 months of quitting smoking are not considered to be related to the act of quitting smoking itself. There are many reasons for coughing up phlegm, such as common cold and tuberculosis. 1. Common cold: its symptoms are mostly coughing with white sputum, no special antiviral drugs, symptomatic treatment. When coughing with phlegm, you can give cough suppressants and phlegm removers such as compound licorice tablets and aminobromine for treatment. At the same time, pay attention to bed rest, drink plenty of water, eat a healthy diet and ensure a certain amount of exercise. 2. Tuberculosis: Tuberculosis is a chronic disease, its main symptom is coughing and coughing up sputum, sputum is mostly white mucus sputum. Anti-tuberculosis drugs include isoniazid, rifampicin and pyrazinamide. Quitting smoking is not harmful to the body, and can reduce the probability of smoking for the body to develop malignant tumors, which is conducive to the health of the body. There are many reasons for coughing up phlegm, coughing up phlegm symptoms, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, in accordance with the doctor’s instructions standardized treatment.