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» Allergy
An allergy is an acquired sensitivity of the immune system. This means that the body’s immune system has become sensitive to one or more common, harmless substances in our environment, such as pollen, dust, molds or even food. This sensitivity causes an immune response, which results in symptoms that range from mild (runny nose, watery eyes, sneezing and itching) or severe (hives, trouble breathing, or anaphylactic shock). Symptoms usually occur with each exposure to the allergen.
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» Cold
Over 200 different types of viruses can cause a cold. Rhinoviruses, which means: nose viruses, are the most common cause. Respiratory syncitial viruses (RSV) and a host of others can produce colds. Of note, influenza viruses occasionally cause illnesses with symptoms of the common cold.
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» Flu
A single family of viruses, the influenza viruses causes the flu. Most people get the flu once every year or two or three, and the illness is unpleasant but not usually dangerous. Unlike the common cold, both adults and children with the flu generally have a fever.
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