ASTHMA

What Is Asthma?

Asthma (Az-muh) is a chronic disease that affects your airways. The airways are the tubes that carry air in and out of your lungs. If you have asthma, the inside walls of your airways are inflamed (swollen). The inflammation (IN-fla-MAY-shun) makes the airways very sensitive, and they tend to react strongly to things that you are allergic to or find irritating. When the airways react, they get narrower, and less air flows through to your lung tissue. This causes symptoms like wheezing (a whistling sound when you breathe), coughing, chest tightness, and trouble breathing, especially at night and in the early morning.

Asthma cannot be cured, but most people with asthma can control it so that they have few and infrequent symptoms and can live active lives.

When your asthma symptoms become worse than usual, it is called an asthma episode or attack. During an asthma attack, muscles around the airways tighten up, making the airways narrower so less air flows through. Inflammation increases, and the airways become more swollen and even narrower. Cells in the airways may also make more mucus than usual. This extra mucus also narrows the airways. These changes make it harder to breathe.

Asthma attacks are not all the same—some are worse than others. In a severe asthma attack, the airways can close so much that not enough oxygen gets to vital organs. This condition is a medical emergency. People can die from severe asthma attacks.

So, if you have asthma, you should see your doctor regularly. You will need to learn what things cause your asthma symptoms and how to avoid them. Your doctor will also prescribe medicines to keep your asthma under control.

Taking care of your asthma is an important part of your life. Controlling it means working closely with your doctor to learn what to do, staying away from things that bother your airways, taking medicines as directed by your doctor, and monitoring your asthma so that you can respond quickly to signs of an attack. By controlling your asthma every day, you can prevent serious symptoms and take part in all activities.

If your asthma is not well controlled, you are likely to have symptoms that can make you miss school or work and keep you from doing things you enjoy. Asthma is one of the leading causes of children missing school.

Signs and symptoms

Asthma signs and symptoms can range from mild to severe. You may have only occasional asthma episodes with mild, short-lived symptoms such as wheezing. In between episodes you may feel normal and have no difficulty breathing. Some people with asthma have chronic coughing and wheezing punctuated by severe asthma attacks.

Most asthma attacks are preceded by warning signs. Recognizing these warning signs and treating symptoms early can help prevent attacks or keep them from becoming worse.

Warning signs and symptoms of asthma in adults may include:

• Increased shortness of breath or wheezing
• Disturbed sleep caused by shortness of breath, coughing or wheezing
• Chest tightness or pain
• Increased need to use bronchodilators — medications that open up airways by relaxing the surrounding muscles
• A fall in peak flow rates as measured by a peak flow meter, a simple and inexpensive device that allows you to monitor your own lung function

Children often have an audible whistling or wheezing sound when exhaling and frequent coughing spasms.

What Causes It?

No one knows exactly what causes asthma. It's thought to be a combination of environmental and genetic (hereditary) factors. A teen with asthma may have a parent or other close relative who has asthma or had it as a child. Teens who are overweight may be more likely to have asthma, although a person doesn't have to be overweight to have it.

Asthma isn't contagious, so you can't catch it from someone who has it.

Asthma symptoms can be brought on by dozens of different things, and what causes asthma flare-ups in one person might not bother another at all. The things that set off asthma symptoms are called triggers. The following are some of the common triggers:

• Allergens.Some people with asthma find that allergens - certain substances that cause an allergic reaction in some people - can be a major trigger. Common allergens are dust mites (microscopic bugs that live in dust), molds, pollen, animal dander, and cockroaches.
• Airborne irritants and pollutants. Certain substances in the air, such as chalk dust or smoke, can trigger asthma because they irritate the airways. Cigarette smoke is a major cause of asthma symptoms, and not just for smokers - secondhand smoke can trigger asthma symptoms in people who are around smokers. Scented products such as perfumes, cosmetics, and cleaning solutions can trigger symptoms, as can strong odors from fresh paint or gasoline fumes. And some research studies have found that high levels of air pollutants such as ozone may irritate the sensitive tissues in the bronchial tubes and can possibly aggravate the symptoms of asthma in some people with the condition.
• Exercise. Some people have what's called exercise-induced asthma, which is triggered by physical activity. Although it can be especially frustrating, most cases of exercise-induced asthma can be treated so that people can still enjoy the sports they love.
• Weather. Cold or dry air can sometimes trigger asthma symptoms in certain people, as can extreme heat or humidity.
• Respiratory tract infections. Colds, flu, and other viral infections can trigger asthma in some people.

There are lots of other things that can trigger asthma symptoms in people with the condition. For example, a girl's asthma can get worse just before her period. And even laughing, crying, and yelling can sometimes cause the airways to tighten in sensitive lungs, triggering an asthma flare-up.