Asthma

The exact cause of asthma isn't known. Researchers think a combination of factors (family genes and certain environmental exposures) interact to cause asthma to develop, most often early in life. These factors include:

• An inherited tendency to develop allergies, called atopy (AT-o-pe)
• Parents who have asthma
• Certain respiratory infections during childhood
• Contact with some airborne allergens or exposure to some viral infections in infancy or in early childhood when the immune system is developing

• Coughing. Coughing from asthma is often 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.

A number of things can bring about 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 found in 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)
• Certain 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
• Exercise (physical activity)

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