Report Anyone get cold or flu symtoms after a run? in Injuries Posted February 22, 2016 Immediately after my 1st day of week 7 I got flu symptoms. Sore achy throat especially. I dont feel like it was something i had coming on already because I am eating healthier than ever, and I had just been sick all of december, and I rarely get sick. It was a very long run for what I'm used to and I was very exhausted, so I don't know if the heavy breathing brought it on or what but it's been 2 days and my throat still feels terrible.