Fatigue is a feeling of exhaustion and weariness that does not go away with rest. Fatigue is not drowsiness that responds to a good night's sleep. Nausea is the feeling of sickness or discomfort in the stomach that produces the urge to vomit.

Almost everyone has some experience with fatigue and muscle aches as many conditions can cause these to symptoms to occur, including a new exercise routine.

If you tend to get colds at the same time every year, they might be seasonal allergies, according to MayoClinic.com. Hay fever and allergies to mold, dust and pet dander can cause fatigue, but so do colds and infections. Body aches aren't usually associated with allergies.