Asthma is a chronic lung disease that affects more than 17 million Americans. Asthma is characterized by inflammation of the airways. The inflammation makes the airways smaller and therefore making it more difficult for air to move in and out of the lung. This creates the symptoms of asthma:
- Chest tightness
- Shortness of breath
Asthma symptoms can be triggered by several factors, including:
- Irritants such as tobacco smoke, strong odors
- Weather changes
- Viral or sinus infections
- Reflux disease (Stomach acid flowing back up the esophagus, or food pipe)
- Medications or foods
- Emotional anxiety
Every person has their own triggers. If you have asthma you can minimize your symptoms by avoiding the factors that trigger your symptoms, and by working with your physician to develop an effective management and treatment plan.
Allergic rhinitis, or "hay fever," is a risk factor in developing asthma. Symptoms of both can be triggered by allergens - any substance that triggers allergies. These include:
- Animal dander
- House dust mite
- Cockroach droppings
If your asthma is triggered by allergens, it is important to avoid exposure to them. See your allergist/immunologist for recommendations on control measures to help avoid allergens.
Inflamed asthmatic airways are sensitive to environmental irritants. Irritants that can trigger and aggravate asthma include:
- Air pollutants such as tobacco smoke, wood smoke, chemicals in the air and ozone
- Occupational exposure to vapors, dust, gases or fumes
- Strong odors or sprays such as perfumes, household cleaners, cooking fumes (especially from frying), paints or varnishes
- Other airborne particles such as coal dust, chalk dust or talcum powder
- Changing weather conditions, such as changes in temperature and humidity, barometric pressure or strong winds
All of these irritants can aggravate asthma, particularly tobacco smoke. Several studies have reported an increased incidence of asthma in children whose mothers smoke. No one should smoke in the home of an asthmatic.
Viral infections such as colds or viral pneumonia can trigger or aggravate asthma, especially in young children. These infections can irritate the airways, nose, throat, lungs, and sinuses, and this added irritation often triggers asthma flare-ups. Additionally, sinusitis - an inflammation of the hollow cavities found around the eyes and behind the nose - can trigger asthma.
Strenuous physical exercise can also trigger attacks. Mouth breathing, exercising in cold, dry air, or prolonged, strenuous activities such as medium- to long-distance running can increase the likelihood of exercise-induced asthma (EIA). For more information, please see the Tips brochure in this series or speak to your allergist/immunologist.
Gastroesophageal reflux disease (GERD), a condition in which stomach acid flows back up the esophagus, can affect patients with asthma. Symptoms include severe or repeated heartburn, belching, night asthma, increased asthma symptoms after meals or exercise, or frequent coughing and hoarseness. GERD reflux treatment is often beneficial for asthma symptoms as well.
Some adults with asthma may experience an asthma attack as a result of taking certain medications. These can include aspirin or other non-steroidal anti-inflammatory drugs (NSAIDS) such as ibuprofen; and beta-blockers (used to treat heart disease, high blood pressure or migraine headaches). Before taking any over-the-counter medications, those with asthma should consult their physicians.
For some, eating certain foods or various food additives can trigger asthma symptoms. Culprits include milk, eggs, peanuts, tree nuts, soy, wheat, fish and shellfish. If any of these foods triggers asthma attacks, the best remedy is to avoid eating them.
Emotional factors alone cannot provoke asthma. However, anxiety and nervous stress can cause fatigue, which may also increase asthma symptoms and aggravate an attack. As with any other chronic health condition, proper rest, nutrition and exercise are important to overall well-being and can help in managing asthma.
Since asthma is a chronic disease, it requires continuous management and appropriate treatment. According to the national Guidelines for the Diagnosis and Management of Asthma (National Asthma Education and Prevention Program, National Institutes of Health, 1997), asthma treatment has four main components:
- The use of objective measure of lung function (such as peak flow meters and spirometers) to assess the severity of asthma and to monitor the course of treatment
- Environmental control measures to avoid or eliminate factors that trigger asthma symptoms or flare-ups
- Medication therapy for long-term management to reverse and prevent airway inflammation as well as therapy to manage asthma flare-ups
- Patient education to foster a partnership between the patients, his or her family, and the physician and other health care providers
According to the Guidelines, there are six goals for the effective management of asthma:
- Prevent chronic and troublesome symptoms
- Maintain (near) "normal" breathing
- Maintain normal activity levels, including exercise
- Prevent recurrent asthma flare-ups, and minimize the need for emergency room visits or hospitalizations
- Provide optimal medication therapy with no or minimal adverse effects
- Meet patients' and families' expectations of satisfactory asthma care
You and your physician can work together on these goals to ensure that your asthma is well-managed. Having asthma should not stop you from participating in normal activities.
Asthma management includes using proper medications to prevent and control asthma symptoms and to reduce airway inflammation. Asthma medications are thus categorized into two general classes, quick-relief and long-term control medications. Quick-relief medications that are used to provide temporary relief of symptoms include:
- Bronchodilators, generally used as "rescue medications," open up the bronchial tubes so that more air can flow through. Bronchodilators include beta-agonists and anticholinergics, and come in inhaled, tablet, liquid or injectable forms.
- Corticosteroids are administered for short-term use orally or by injection to speed up the resolution of airway inflammation
Long-term control medications are taken daily to control the airway inflammation in persistent asthma. This class includes:
- Inhaled corticosteroids are the most effective long-term therapy available for persistent asthma. They are generally well tolerated and safe at recommended dosages.
- Cromolyn or Nedocromil stop the development of inflammation in the lungs, as well as help to prevent it. Response to these two are less predictable then the response to inhaled corticosteroids. These medications are very safe.
- Leukotrienes modifiers fight potent chemicals called leukotrienes (lu-ko-try-eens) responsible for airway inflammation within the body. They are generally safe.
- Inhaled beta 2-agonists are long-acting and beneficial when added to inhaled corticosteroids.
- Methylxanthines provide mild to moderate dilation of the airways and may have a mild anti-inflammatory effect. Theophylline is the most frequently used methylxanthine.
- Omalizumab was approved in 2003 as a new class of therapy, known as anti-IgE, for patients with moderate to severe persistent allergic asthma. IgE is an antibody that we all have and it is responsible for causing allergic problems in some people. It may reduce allergic reactions by causing free IgE to disappear from the body so that the IgE cannot attach to pollen (and other substances that are present).
Combination therapy, with the addition of a long-acting beta2-agonist to low-to-medium doses of inhaled corticosteroids, results in improvement in asthma control. Adding a leukotriene modifier or theophylline to inhaled corticosteroids also improves asthma control but the evidence is not as substantial.
Make sure you follow your physician's instruction on the appropriate use and dosage of your prescribed medications.
The better informed you are about your asthma triggers and management, the less asthma symptoms will interfere with your activities. It is important to avoid your triggers, work with your physician on a management plan and take appropriate medications as prescribed. Together, you and your allergist/immunologist can work to ensure that asthma does not interfere with your optimal quality of life.
For more information on any of the topics mentioned in this brochure, please see the appropriate Tips brochures in this series or speak with an allergist/immunologist.
Your allergist/immunologist can provide you with more information on asthma triggers and management.
Tips to Remember are created by the Public Education Committee of the American Academy of Allergy, Asthma and Immunology. This brochure was updated in 2003.
The content of this brochure is for informational purposes only. It is not intended to replace evaluation by a physician. If you have questions or medical concerns, please contact your allergist/immunologist.
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