According to the National Institutes of Health, if you have a cold, you are most contagious and should stay at home for the first 2 to 3 days, and you are usually not contagious by days 7 to 10. Colds usually last from 3 to 14 days. To prevent cold reoccurrence, wash your hands often, stay away from people who are having cold symptoms, and support your immune system.
Think It May Be Allergies?
The treatment of allergies focuses primarily on avoidance of the allergen, and on symptom management. To prevent allergies, talk with your health-care provider to try to determine your triggers, and take measures to avoid them. You may also want to ask about allergy medications, if your symptoms are constant or unmanageable. In contrast to the common cold, allergies are not contagious, so as long as your symptoms are manageable you don’t need to stay home.
In most cases, you don’t need to see a doctor if you are having symptoms of a cold or allergies, unless your symptoms become unmanageable, if breathing becomes difficult, if your symptoms get worse, or if you don’t start to get better within 7 to 10 days.
Is it a Cold or an Allergy? from the National Institute of Allergy and Infectious Disease.
Common Cold, from Medline Plus.
Was Grandma Right? Chicken Soup’s Health Benefits, from the Office of Research Services of the National Institutes of Health.