i also have felt this, but for me it felt like i had salt in my lungs. not sure what it is tho
Very strange symptom, to me at least. Maybe someone who reads can relate.
Some general observations:
1) if it passes and there are no other symptoms it may be "nothing"
2) if you smoke or have been exposed to some contaminants in the air, that may be the problem, stay away from that exposure
3) if you have other symptoms, what are they
4) when have you last seen a doctor, say for a general physical exam