Im having grey material in my mucus when coughing. the mucus itself is clear with separate grey fiber like material. any ideas?

Should get a chest x: The duration of cough is important! Are you a smoker? Is the cough associated with fever? Do you have asthma? What melds do you take? All these issues need to be clarified to better understand the reason for your cough! Any occupational exposure to Birds, chemicals or other potential environmental conditions that could continue your cough symptoms? Sometimes gastric reflux may perpetuate or aggrav