It's important to know the difference between flu and cold symptoms. A cold is a milder respiratory illness than the flu. While cold symptoms can make you feel bad for a few days, flu symptoms can make you feel quite ill for a few days to weeks. The flu -- whether it's typical seasonal flu or the swine flu virus -- can also result in serious health problems such as pneumonia and hospitalizations.
 Colds and Flu
What are common cold symptoms?
Cold symptoms usually begin with a sore throat, which usually goes away after a day or two. Nasal symptoms, runny nose, and congestion follow, along with a cough by the fourth and fifth days. Fever is uncommon in adults, but a slight fever is possible. Children are more likely to have a fever with a cold.

With cold symptoms, your nose teems with watery nasal secretions for the first few days. Later, these become thicker and darker. Dark mucus is natural and does not usually mean you have developed a bacterial infection, such as a sinus infection.

Several hundred different viruses may cause your cold symptoms.

How long do cold symptoms last?
Cold symptoms usually last for about a week. During the first three days that you have cold symptoms, you are contagious. This means you can pass the cold to others, so stay home and get some much-needed rest.

If cold symptoms do not seem to be improving after a week, you may have a bacterial infection, which means you may need antibiotics.

Sometimes you may mistake cold symptoms for allergic rhinitis (hay fever) or a sinus infection. If your cold symptoms begin quickly and are improving after a week, then it is usually a cold, not allergy. If your cold symptoms do not seem to be getting better after a week, check with your doctor to see if you have developed an allergy or sinusitis.

What are common flu symptoms?
Whether a person has typical seasonal flu or swine flu, the symptoms seem to be quite similar. Flu symptoms are usually more severe than cold symptoms and come on quickly. Symptoms of swine flu or other flu include sore throat, fever, headache, muscle aches and soreness, congestion, and cough. Swine flu in particular is also associated with vomiting and diarrhea.

Most flu symptoms gradually improve over two to five days, but it's not uncommon to feel run down for a week or more. A common complication of the flu is pneumonia, particularly in the young, elderly, or people with lung or heart problems. If you notice shortness of breath, you should let your doctor know. Another common sign of pneumonia is fever that comes back after having been gone for a day or two.

Just like cold viruses, flu viruses enter your body through the mucous membranes of your nose, eyes, or mouth. Every time you touch your hand to one of these areas, you could be infecting yourself with a virus, which makes it very important to keep your hands germ-free with frequent washing to prevent both flu and cold symptoms.

Is it flu or cold symptoms?
How do you know if you have flu or cold symptoms? Take your temperature, say many experts. Whether it's seasonal or swine influenza, the symptoms often mimic cold symptoms with nasal congestion, cough, aches, and malaise. But a common cold rarely has symptoms of fever above 101 degrees F. With flu symptoms, you will probably have a fever initially with the flu virus and you will feel miserable. Body and muscle aches are also more common with the flu. This table can help determine if you have cold or flu symptoms.

Symptoms                        Cold                                                               Flu

Fever                 Sometimes, usually mild                  Usual; higher (100-102 F; occasionally )     

Headache                      Occasionally                                             Common

General Aches, Pains          light                                         Usual; often severe

Fatigue, Weakness        Sometimes                                 Usual; can last 2 to 3 weeks

Extreme Exhaustion           Never                             Usual; at the beginning of the illness

Stuffy Nose                       Common                                               Sometimes

Sneezing                             Usual                                                   Sometimes

Sore Throat                       Common                                              Sometimes

Chest Discomfort, Cough  Mild to moderate; hacking cough Common; can become severe

Complications     Sinus congestion; middle ear infection  Sinusitis, bronchitis, ear infection, pneumonia; can be life-threatening

Wash your hands often; avoid close contact with anyone with a cold
Wash your hands often; avoid close contact with anyone who has flu symptoms; get the annual flu vaccine, which protects against the H1N1 swine flu and two other flu strains for the 2010-2011 flu season.

Decongestants; pain reliever/fever reducer medicines
Decongestants, pain relievers, or fever reducers are available over the counter; over-the-counter cough and cold medicines should not be given to young children; prescription antiviral drugs for flu may be given in some cases; call your doctor for more information about treatment.

Usually, the time of year will give you some sense of what you're dealing with. The standard flu season runs from fall to spring of the next year.

When do I call the doctor with flu or cold symptoms?
If you already have flu or cold symptoms, it's important to call your doctor if you also have any of the following severe symptoms:

Persistent fever: This can be a sign of another bacterial infection that should be treated.
Painful swallowing: Although a sore throat from a cold or flu can cause mild discomfort, severe pain could mean strep throat, which requires treatment by a doctor.
Persistent coughing: When a cough doesn't go away after two or three weeks, it could be bronchitis, which may need an antibiotic. Postnasal drip or sinusitis can also result in a persistent cough. In addition, asthma is another cause of persistent coughing.
Persistent congestion and headaches: When colds and allergies cause congestion and blockage of sinus passages, they can lead to sinus infection. If you have pain around the eyes and face with thick nasal discharge after a week, you may have a bacterial infection and need an antibiotic.
In some cases, you may need to get emergency medical attention right away. In adults, signs of a crisis include:

Severe chest pain
Severe headache
Shortness of breath
Persistent vomiting
In children, additional signs of an emergency are:

Difficulty breathing or rapid breathing
Bluish skin color
Not drinking enough fluids
Lethargy and failure to interact normally
Extreme irritability or distress
Symptoms that were improving and then suddenly worsen
Fever with a rash

Can I prevent flu or cold symptoms?
The most important prevention measure for preventing colds and flu is frequent hand washing. Hand washing by rubbing the hands with warm soapy water for at least 20 seconds helps to slough germs off the skin.

In addition to hand washing to prevent flu or cold symptoms, you can also get a flu vaccine to prevent seasonal influenza. Seasonal flu activity in the United States generally peaks between late December and early March. Within two weeks of getting a flu vaccine, antibodies develop in your body and provide protection against flu. Children receiving the vaccine for the first time need two doses delivered one month apart.

Antivirals may also help prevent flu if you have been exposed to someone with flu symptoms.