hi i'm 21 years old. i just want to ask what are the possible causes of my cough?. My cough started last november until now., but it's not the cough where in i cough vigorously or too much, it's as if i'm trying to get something out of my throat. it just makes me paranoid that it lasted this long. i don't have other symptoms, only this cough. I became paranoid because i thought i was at risk for kaposi's sarcoma because i noticed some changes in my skin, but somebody from the other forum said no, because it is only associated with hiv/aids, in which i took 2 tests because i had a risky exposure in the past which both came out negative ( i took the test 5 months post exposure, in which the recommendation in taking the test would be 3 months, i had mine at 5 and it came out negative) please help.. thank you