I had that a few days ago. I went out on a warm day and it was very windy, and the wind was in my face a lot. So i had to expend more effort. THe next day, i had a sore chest and a cough. I thought maybe i was getting sick, there have been a lot of colds lately. BUt I realized i'd had this before. It was also probably all the dust blowing around on my ride. I felt fine the day after that.
You can catch more flies with honey than with vinegar. That's great...if you want to attract vermin.