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What Are the Signs and Symptoms of Asthma?

Common signs and symptoms of asthma include:

  • Coughing. Coughing from asthma often is worse at night or early in the morning, making it hard to sleep.
  • Wheezing. Wheezing is a whistling or squeaky sound that occurs when you breathe.
  • Chest tightness. This may feel like something is squeezing or sitting on your chest.
  • Shortness of breath. Some people who have asthma say they can't catch their breath or they feel out of breath. You may feel like you can't get air out of your lungs.

Not all people who have asthma have these symptoms. Likewise, having these symptoms doesn't always mean that you have asthma. The best way to diagnose asthma for certain is to use a lung function test, a medical history (including type and frequency of symptoms), and a physical exam.

The types of asthma symptoms you have, how often they occur, and how severe they are may vary over time. Sometimes your symptoms may just annoy you. Other times, they may be troublesome enough to limit your daily routine.

Severe symptoms can be fatal. It's important to treat symptoms when you first notice them so they don't become severe.

With proper treatment, most people who have asthma can expect to have few, if any, symptoms either during the day or at night.

What Causes Asthma Symptoms To Occur?

Many things can trigger or worsen asthma symptoms. Your doctor will help you find out which things (sometimes called triggers) may cause your asthma to flare up if you come in contact with them. Triggers may include:

  • Allergens from dust, animal fur, cockroaches, mold, and pollens from trees, grasses, and flowers
  • Irritants such as cigarette smoke, air pollution, chemicals or dust in the workplace, compounds in home décor products, and sprays (such as hairspray)
  • Medicines such as aspirin or other nonsteroidal anti-inflammatory drugs and nonselective beta-blockers
  • Sulfites in foods and drinks
  • Viral upper respiratory infections, such as colds
  • Physical activity, including exercise

Other health conditions can make asthma harder to manage. Examples of these conditions include a runny nose, sinus infections, reflux disease, psychological stress, and sleep apnea. These conditions need treatment as part of an overall asthma care plan.

Asthma is different for each person. Some of the triggers listed above may not affect you. Other triggers that do affect you may not be on the list. Talk with your doctor about the things that seem to make your asthma worse.

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About Clinical Trials

Clinical trials are research studies that explore whether a medical strategy, treatment, or device is safe and effective for humans. These studies are a key research tool for advancing medical knowledge and patient care. Learn more about clinical trials.



Asthma Clinical Trials

Clinical trials currently are under way for Asthma. For more information about these studies, visit www.clinicaltrials.gov.



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Because children are not little adults, they need clinical research that focuses exclusively on them. Clinical research will bring us closer to finding the best treatments, medicines, and devices for children who are growing and developing.

Visit the NHLBI’s Children and Clinical Studies Web site to hear experts, parents, and children talk about their experiences with clinical research.


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February 01, 2011 Last Updated Icon

The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.

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