Asthma is a chronic disease that causes the airways of the lungs to swell and narrow. It leads to breathing difficulty such as wheezing, shortness of breath, chest tightness, and coughing.
Asthma is a disease in which inflammation of the airways causes airflow into and out of the lungs to be restricted. The muscles of the bronchial tree become tight and the lining of the air passages swells, reducing airflow and producing the characteristic wheezing sound. This is known as an asthma attack, which can occur as an allergic reaction to an allergen or other substance (acute asthma), or as a part of a complex disease cycle which may include reaction to stress or exercise (chronic asthma).
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Asthma quick-relief drugs
Asthma quick-relief drugs work fast to control asthma symptoms. You take them when you are coughing, wheezing, having trouble breathing, or having an asthma attack. Contact your health care provider if you need them every day.
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Asthmatic bronchiole and normal bronchiole
Asthma is a disease in which inflammation of the airways causes airflow into and out of the lungs to be restricted. When an asthma attack occurs, mucus production is increased, muscles of the bronchial tree become tight, and the lining of the air passages swells, reducing airflow and producing the characteristic wheezing sound.
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Asthma control drugs
Control drugs for asthma must be taken every day in order for them to work. You may need to take them more than once daily. Take them as prescribed by your health care provider.
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Asthma quick relief drugs
Asthma quick-relief drugs work fast to control asthma symptoms. You take them when you are coughing, wheezing, having trouble breathing, or having an asthma attack. Contact your health care provider if you need them every or almost every day.
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Asthma control drugs
Control drugs for asthma must be taken every day in order for them to work. You may need to take them more than once daily. Take them as prescribed by your health care provider.
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Asthma triggers
It is important to know what things make your asthma worse. These are called asthma "triggers. " Avoiding them is your first step toward feeling better. The most common asthma triggers are respiratory tract infections caused by viruses such as the flu, common cold, and other viruses. Other triggers are cold and dry air, mold, pets, dust, grasses, pollen, cockroaches, odors from chemicals, and smoke from cigarettes.
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Normal versus asthmatic bronchiole
During an asthma attack smooth muscles located in the bronchioles of the lung constrict and decrease the flow of air in the airways. The amount of air flow can further be decreased by inflammation or excess mucus secretion.
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Common asthma triggers
Many of the same substances that trigger allergies can also trigger asthma. Common allergens include pollen, dust mites, mold and pet dander. Other asthma triggers include irritants like smoke, pollution, fumes, cleaning chemicals, and sprays. Asthma symptoms can be substantially reduced by avoiding exposure to known allergens and respiratory irritants.
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Exercise-induced asthma
Exercise-induced asthma is distinct from allergic asthma in that it does not produce long-term increase in airway activity. People who only experience asthma when they exercise may be able to control their symptoms with preventive measures such as warm-up and cool-down exercises.
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Asthma - Animation
Breathing is something we do without even thinking about it. But some people have a hard time breathing easily. They wheeze, cough, and just can't get enough air into their lungs. Let's talk about asthma. Normally when you breathe, oxygen-rich air enters your nose and mouth and travels to the airways in your lungs. But when you have an asthma attack, the muscles in your airways tighten. Your airways swell up and get narrower. It's like pressing on a straw when you're trying to drink through it. The more you press, the less of your drink can squeeze up through the straw. In the same way, less air can squeeze through tight airways into your lungs. So, what causes asthma?People with asthma have different triggers. Some people are sensitive to pet hair or dander. Others find that dust, pollen, smoke, or chemicals make them wheeze. You may have trouble breathing when you're under stress or working out at the gym. Often people with asthma have allergies that trigger their attacks. Others have a parent or other relative who has allergies. You may ask, how can you know for sure that you have asthma?During an asthma attack, you'll have trouble breathing. You may cough or wheeze as you try to draw air into your lungs. If you're having a severe attack, your lips and face may turn blue and you'll have a hard time getting any air. That's when it's time to call for emergency help. Your doctor will listen to your lungs with a stethoscope, and may do other tests to check your blood and lung function. To find out what's triggering your asthma, you may need to be tested for allergies to mold, pollen, pet dander, or other substances. To measure the strength of air flowing out of your lungs, you'll blow into a device called a peak flow meter. You can also use a peak flow meter to make sure you're keeping your asthma under control. Different medicines are used to prevent and treat asthma. Control drugs help you avoid asthma attacks, but you need to take them every day for them to work. You breathe in control drugs like Flovent and Pulmicort through an inhaler. If you’re having an asthma attack, you can take a quick-relief drug to control your wheezing. Examples of quick-relief drugs include short-acting inhaled drugs like Albuterol. When you have asthma, you need to be prepared. Know your asthma triggers and try to avoid them. Carry an inhaler with you in case you have an asthma attack. If you ever have an attack that's so severe you can't breathe, call 911 or get emergency medical help.
Asthma - children - Animation
Did you know that asthma is one of the most common disorders affecting children, as many as 10 percent of them? Thankfully, advances in the diagnosis and treatment of asthma have dramatically improved life for these children. Asthma is caused by swelling and other signs of inflammation in the airways. When an asthma attack occurs, the muscles surrounding the airways become tight and the lining of the air passages swells. This reduces the amount of air that can pass by the bronchioles, or small tubes, of the lung. Most asthma attacks are caused by triggers, such as pollen, dust mites, mold, pet dander, cockroaches, tobacco smoke, and exercise. Your child may have asthma if they experience shortness of breath, maybe gasp for air, and have trouble breathing out. When breathing gets very difficult, the skin of your child's chest and neck may suck inward. Your child may cough so hard at night he wakes from sleeping. He may have dark bags under his eyes and feel tired and irritable. Your child's doctor will listen to your child's lungs. The doctor will have your child breathe into a device called a peak flow meter. This device can tell you and your child's doctor how well the child can blow air out of his lungs. If asthma is narrowing and blocking your child's airways, his peak flow values will be low. To treat your child with asthma, you will need to work with your child's pediatrician, pulmonologist, or allergist as a team. Your child will need an action plan that outlines his asthma triggers and how to avoid them, how to monitor his symptoms, measuring peak flow, and taking medicines. You should have an emergency plan that outlines what to do when your child's asthma flares up, at home and in school. Make sure the school has a copy of your child's asthma action plan too. Your child will probably need to take two kinds of medicines, long-term control medicines and quick relief or "rescue" medicines. Your child will take long-term control medicines every day to prevent asthma symptoms, even when he has none. Your child will need to use quick relief medicines during an asthma attack. If your child needs to use an inhaler with his medicines, make sure the doctor shows him how to use a spacer device, to get the medicine into his lungs properly. Today, most children with properly managed asthma can lead a life unhindered by their disease. It shouldn't hold them back from even the highest levels of athletic competition. With proper education and medical management, it is possible to control this disease on a daily basis and prevent asthma attacks.
Review Date:
1/22/2023+
Reviewed By:
Denis Hadjiliadis, MD, MHS, Paul F. Harron, Jr. Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Internal review and update on 02/10/2024 by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
