From an Expert at UHCS:
Often it is difficult to sort through what's a "cold" and what's the "flu" and then know what to do about each of those. In general, they share similar symptoms and both affect the respiratory system, but are caused by different viruses. Typically, symptoms of a cold tend to be milder, including runny/stuffy nose, sore throat, cough, and sneezing. While colds are common, it doesn't mean that you should ignore it. Drink lots of fluids and see below (under "More Information") for self-care tips that target your specific symptoms so that you can feel better as soon as possible, but if you feel worse despite doing these things and especially if you note a fever of 100F or higher, severe pain, or breathing problems, call or set up an appointment to be seen urgently. Complications of a cold include sinus congestion or ear ache.
Influenza, commonly known as "flu," is more likely to make it nearly impossible to do usual activities. You probably have the flu if you are running a fever>100°F and have a cough or sore throat and feel much worse than you do when you get a cold. You may also have headaches, body aches and be sick to your stomach.
Most persons with influenza will not need to visit a health care provider, however, you do need to call and make an appointment with a health care provider if you:
Some things you can do to help you get through the flu are:
Also, remember that if you have flu symptoms (fever>100°F and cough or sore throat) stay at home until at least 24 hours after symptoms are gone (without the use of fever-reducing medications) - this will help you recover sooner and protect others from getting sick!
If you live in university housing, let housing staff know that you have flu-like symptoms so that you can be issued a surgical mask.
Remember, prevention of illnesses is important for your own health, as well as the health of others around you. Family members, friends, and fellow students, especially the very young and old, people with asthma or other chronic health problems rely on you to do your part to keep everyone healthy. Wash your hands (either soap and water or alcohol-based hand sanitizer) every time you cough/sneeze/touch your hands to your face and get a flu shot every year (generally advised in September).
WebMD - Information about colds and flu and how to differentiate between them http://www.webmd.com/cold-and-flu/default.htm
UHCS Cold Self Care brochure self-care strategies for sore throats, runny/stuff nose, fevers, aches/pains, as well as symptoms to watch out for.