Asthma

Asthma is a chronic lung condition causing the lining of the airway to swell (inflammation). Chest muscles tighten causing the airway to narrow limiting the amount of air that can pass through the airway. 

Common symptoms are wheezing, coughing, a feeling of chest tightness or other breathing trouble.  Often people complain of feeling out of breath, unable to breathe out, shortness of breath or breathing faster than normal.

Causes

Asthma is caused by swelling (inflammation) in the airways. When an asthma attack occurs, the lining of the air passages swells and the muscles surrounding the airways become tight. This reduces the amount of air that can pass through the airway.

Common asthma triggers include:

  • Animals (pet hair or dander)
  • Dust mites
  • Certain medicines (aspirin and other NSAIDS)
  • Changes in weather (most often cold weather)
  • Chemicals in the air or in food
  • Physical activity
  • Mold
  • Pollen
  • Respiratory infections, such as the common cold
  • Strong emotions (stress)
  • Tobacco smoke

Substances in some workplaces can also trigger asthma symptoms, leading to occupational asthma. The most common triggers are wood dust, grain dust, animal dander, fungi, or chemicals.

Many people with asthma have a personal or family history of allergies, such as hay fever (allergic rhinitis) or eczema. Others have no history of allergies.

Symptoms

Asthma symptoms vary from person to person. Some people have symptoms all the time while others may only have symptoms with physical activity. Wheezing or a cough may be the main symptom.

Most people with asthma have attacks separated by symptom-free periods. Some people have long-term shortness of breath with episodes of increased shortness of breath.

Asthma attacks can last for minutes to days. An asthma attack may start suddenly or develop slowly over several hours or days. It may become dangerous if airflow is severely blocked.

Symptoms of asthma include:

Exams and Tests

The health care provider will use a stethoscope to listen to your lungs. Wheezing or other asthma-related sounds may be heard. The provider will take your medical history and ask about your symptoms.

Tests that may be ordered include:

Treatment

The goals of treatment are:

You and your provider should work as a team to manage your asthma symptoms. Follow your provider’s instructions on taking medicines, eliminating asthma triggers, and monitoring symptoms.

Medicines for Asthma 

There are two kinds of medicines for treating asthma:

Asthma Care at Home

You can take steps to decrease the possibility of asthma attacks:

Asthma action plans are written documents for managing asthma. An asthma action plan should include:

  • Instructions for taking asthma medicines when your condition is stable
  • A list of asthma triggers and how to avoid them
  • How to recognize when your asthma is getting worse, and when to call your provider

A peak flow meter is a simple device to measure how quickly you can move air out of your lungs.

Outlook (Prognosis)

There is no cure for asthma, although symptoms sometimes improve over time. With proper self-care and medical treatment, most people with asthma can lead a normal life.

Possible Complications

The complications of asthma can be severe, and may include:

  • Death
  • Decreased ability to exercise and take part in other activities
  • Lack of sleep due to nighttime symptoms
  • Permanent changes in the function of the lungs
  • Persistent cough
  • Trouble breathing that requires breathing assistance (ventilator)

When to Contact a Medical Professional

Contact your provider for an appointment if asthma symptoms develop.

Contact your provider right away if:

  • An asthma attack requires more medicine than recommended
  • Symptoms get worse or do not improve with treatment
  • You have shortness of breath while talking
  • Your peak flow measurement is 50% to 80% of your personal best

Go to the emergency room right away if these symptoms occur:

  • Drowsiness or confusion
  • Severe shortness of breath at rest
  • A peak flow measurement of less than 50% of your personal best
  • Severe chest pain
  • Bluish color to the lips and face
  • Extreme difficulty breathing
  • Rapid pulse
  • Severe anxiety due to shortness of breath

Prevention

You can reduce asthma symptoms by avoiding triggers and substances that irritate the airways.

  • Cover bedding with allergy-proof casings to reduce exposure to dust mites.
  • Remove carpets from bedrooms and vacuum regularly.
  • Use only unscented detergents and cleaning materials in the home.
  • Keep humidity levels low and fix leaks to reduce the growth of organisms such as mold.
  • Keep the house clean and keep food in containers and out of bedrooms. This helps reduce the possibility of cockroaches. Body parts and droppings from cockroaches can trigger asthma attacks in some people.
  • If someone is allergic to an animal that cannot be removed from the home, the animal should be kept out of the bedroom. Place filtering material over the heating/air conditioning outlets in your home to trap animal dander. Change the filter in furnaces and air conditioners often.
  • Eliminate tobacco smoke from the home. This is the single most important thing a family can do to help someone with asthma. Smoking outside the house is not enough. Family members and visitors who smoke outside carry smoke residue inside on their clothes and hair. This can trigger asthma symptoms. If you smoke, now is a good time to quit.
  • Avoid air pollution, industrial dust, and irritating fumes as much as possible.

References

Boulet L-P, Godbout K. Diagnosis of asthma in adults. In: Burks AW, Holgate ST, O’Hehir RE, et al, eds. Middleton’s Allergy: Principles and Practice. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 51.

Brozek JL, Bousquet J, Agache I, et al. Allergic rhinitis and its impact on asthma (ARIA) guidelines-2016 revision. J Allergy Clin Immunol. 2017;140(4):950-958. PMID: 28602936 pubmed.ncbi.nlm.nih.gov/28602936/.

Cloutier MM, Dixon AE, Krishnan JA, Lemanske RF Jr, Pace W, Schatz M. Managing Asthma in Adolescents and Adults: 2020 Asthma Guideline Update From the National Asthma Education and Prevention Program. JAMA. 2020;324(22):2301-2317. PMID: 33270095 pubmed.ncbi.nlm.nih.gov/33270095/.

Liu AH, Spahn JD, Sicherer SH. Childhood asthma. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 169.

Marcdante KJ, Kliegman RM, Schuh AM. Asthma. In: Marcdante KJ, Kliegman RM, Schuh AM, eds. Nelson Essentials of Pediatrics. 9th ed. Philadelphia, PA: Elsevier; 2023:chap 78.

Vohra TT, Nowak RM. Asthma. In: Walls RM, ed. Rosen’s Emergency Medicine: Concepts and Clinical Practice. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 59.