Every winter for the past 4 years, I get a dry cough (no mucus) that will last for 4 months. My throat does not hurt, I have no other symptoms of sickness (no headache, no stomache ache, etc.). The doctor at my university hospital did a checkup, then prescribed me antibiotics last year. I was skeptical, since I had a feeling this was not viral but I took the full cycle anyways. It did not help. I simply waited until the cough went away during the springtime. This year, same thing... and again the doctor prescribes antibiotics. I have not taken them, and will not. Can someone suggest what the possible causes of this cough can be, so I can make suggestions and be more knowledgeable when I see another doctor? I live in Michigan (to give you an idea of the winter climate).