Allergic Asthma Make an Appointment Refer a Patient Ask a Question Reviewed by Flavia Cecilia Lega Hoyte, MD (February 07, 2023) Allergies can make asthma worse. In people with allergies, the immune system becomes sensitive to normally harmless substances known as allergens. Common allergens include pollens (trees, grasses, weeds), mold spores, animal dander from feathered or furry animals, dust mites (a major component of house dust in humid climates) and cockroaches. On contact with the allergen, the allergic person’s body produces chemicals that irritate the inflamed airways and lead to symptoms. Allergy symptoms may include itchy eyes, runny nose, asthma symptoms, skin problems (eczema) and/or a rash. Depending upon you or your child’s medical and family history, age and environment, allergy testing may be necessary. We recommend that testing be done under the supervision of a board-certified allergist. In most cases, skin testing for allergens is preferable to blood tests. Knowing if your child is allergic, and to what, can help you take appropriate measures in your home to decrease exposure to these allergens. Although many preventive measures are important for the entire home, your bedroom is the most important room in the house, because that is where you usually spend a large portion of your time at home. Learn how to reduce allergies and asthma, based on your type of allergy. Animal allergy Dust mite allergy Food allergy (Food allergies rarely make asthma worse.) Latex allergy Mold allergy Pollen allergy Allergy Shots (Immunotherapy) If you have allergic asthma, taking action to avoid exposure is recommended, whenever possible. This can be difficult if you are allergic to pollen, molds, and dust mites. Allergy medications, including nasal sprays and antihistamines, and nasal irrigations can help control symptoms. If actions to avoid exposure and medications are not effective, your doctor might consider allergy shots. Allergy shots have been shown to reduce symptoms associated with pollen, certain molds, dust mites and animal dander. Nocturnal Asthma Clinical Trials For more than 100 years, National Jewish Health has been committed to finding new treatments and cures for diseases. Search our clinical trials.