Does anyone get a sore throat after physical activity? Following clear limits I worked out yesterday but pushed it a little bit too much. The consequence was that I was very fatigued for the rest of the day and couldn't even do standard paper work. Before I went to bed my nose started running and today I feel miserable, have a sore throat and tons of yellow mucus accumulated in my nose. This happens in 90% of the cases where I overdo it a little bit and feel extremely fatigued for the rest of the day after working out. Does anyone have an explanation for this? I always thought that it takes more than 24 hours for symptoms to occur after a cold/flu infection.