Most symptoms of allergies to mold, dander, and dust can be readily treated, and regular treatment can minimize the symptoms.

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In some cases (particularly in children), people may outgrow an allergy as the immune system becomes less sensitive to the allergen. However, as a general rule, once a substance causes allergies for an individual, it can continue to affect the person long term.

People who are allergic to mold may also be allergic to penicillin, which is derived from a variety of mold. They may also be allergic to blue cheese, which is an ingredient of some salad dressings.

As noted earlier, the most severe cases of allergic rhinitis from these allergens may require immunotherapy (allergy shots) or removal of tissue in the nose (e.g., nasal polyps) or sinuses.

• frequent ear infections (otitis media) in children
• drowsiness and other side effects of antihistamines
• side effects of other medications (see the specific medication)
• sinusitis and/or nasal polyps
• hives or other skin rashes
• anaphylaxis (a rare but severe allergic reaction)
• disruption of lifestyle
• children may breathe through the mouth instead of the nose, with resultant facial changes