Hi,
3 months is a long time to suffer from coughing out white mucus without any other symptoms other than feeling tightness in chest, X-ray and pulmonary function tests being normal.
I would think of the following in such a situation:
- excessive mucus production can be due to irritation to the
respiratory tract with something like fumes, dust, pollen, anything for that matter which can be identified by you alone.
- Keen observation of the instigating and enhancing factors.
- Take an opinion of a Pulmonologist.
- May need a short course of oral
steroids in tapering doses.
- Antihistamine.
- Avoidance of of instigating and enhancing factors.
- Wet dusting in office and home.
- Repair the home to stop water leakage to avoid the developement of molds and mildew.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, ENT & General Surgeon