I developed a cough, and within a few days, I began to notice a crackling sound when I exhale. I did not have any sinus
symptoms, or sore throat or fever. My cough is beginning to get better, but the crackling sound is still there. There was a
slight amount of mucus with the cough, as to the color I do not know. But there was not always mucus with the cough, and
still the crackling sound remains. Also, I've had a terrible headache over the last few days. What could be the cause?