There are many schools of thought when it comes to being sick and working out. A Google search will get you all sorts of varying information. It seems the general rule of thumb is the above the neck rule. If your symptoms are all above the neck, working out should be okay, unless of course, they are severe or include muscle aches/fatigue (which would mean they were not just above the neck).
What is an under the weather workout enthusiast to do?
The good news is that we should have to deal with this issue less often than our couch potato friends. It is still likely that you will find yourself faced with this dilemma at some point during cold and flu season. Ultimately you are going to have to listen to your body and give it what it needs. Resting a day or two will not ruin your results and may help you recover quicker. You don’t want to be sidelined for two weeks because you were unwilling to take off two days.
If you decide to workout, you may want to go at it with a little less intensity. Usually a runner? Try a walk or the recumbent bike. If you workout in a gym SANITIZE SANITIZE SANITIZE after you use the equipment, your fellow gym goers do not want what you have!
from MensHealth.com: Flu-Fighting Chilli