Is it a cold or the flu? Things you hear are not always true. Read on to bust a myth or two.

Myth: Anytime you attract a cold or flu, call your doctor.

Truth: Cold or flu should work itself out of your system after about seven days. You should consult with your doctor if symptoms persist beyond a week or if you experience any of the following symptoms: severe hoarseness, sore throat, greenish or dark-yellow discharge from the nose, or intense ear pain.

Myth: New prescription drugs released on the market for flu this winter will knock out colds as well.

Truth: New drugs have been developed to help fight flu, but they don't treat colds. And, even if you take a flu drug, you still may get symptoms, such as coughs and nasal congestion, that must be treated by over-the-counter medications.

Myth: Cold misery takes its course, and nothing you do makes much of a difference.

Truth: It's true that there is no cure for colds. However, your doctor or pharmacist can recommend over-the-counter medicines that can offer comforting symptom relief.

Myth: If someone in my family gets sick, everyone else soon will be sick.

Truth: While you can't completely prevent the spread of respiratory illness, there are precautions you can take. For example, wash your hands frequently to control the spread of germs.

Myth: Flu shots are only for those at high risk of respiratory problems, such as the elderly.

Truth: According to the U.S. Food and Drug Administration, vaccination is a powerful weapon for anyone hoping to reduce their likelihood of contracting the flu. Studies have shown the vaccine's effectiveness rate to be 70 to 90 percent in healthy adults. Consult your doctor for advice.