My father is coughing up hard super sticky grey balls of Phelgm every morning. It is not like the normal saliva we see, but greyish white ball like. However, as the day progresses, he coughs up phelgm which is sticky but not like the one in the morning. What can be the cause? Please suggest medications. This has been going in for 3 months and he has no fever and also not on any medication. Does the Air Conditioner at night affect him? But this has happened only recently. There are also black particles in his phelgm.