Coughing up mucus for no reason

Patient: I have a question my whole family in january had an upper respitory infection and ever since i have been coughing up a lot of mucus and somtimes not even coughing just having to clear my throat to get it up what could this be or what would cause this the reason i dont go to the doctor is because i dont work and i dont have insurance please help if you can

Doctor:

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