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Adult-Onset Asthma

When asthma symptoms appear and are diagnosed in adults older than 20, it is typically known as adult-onset asthma. Adult-onset asthma is more common in women than in men and is possibly related to allergies or allergic asthma. About half of adults who have asthma also have allergies. At other times, adult-onset asthma may be the result of commonplace substances in work (called occupational asthma) or home environments, and the asthma symptoms come on suddenly.

What is asthma?

Asthma is a disorder of the lungs that causes the airways to:

  • Swell (or become inflamed), specifically in the airway linings


  • Produce large amounts of mucus that is thicker than normal


  • Become more narrow because of muscle contractions surrounding the airways

The symptoms of asthma include:

What is adult-onset asthma?

When a doctor makes a diagnosis of asthma in people older than 20, it is known as adult-onset asthma.

Among those who may be more likely to get adult-onset asthma are:

  • Women who are having hormonal changes, such as those who are pregnant or who are experiencing menopause


  • Women who take estrogen following menopause for 10 years or longer


  • People who have just had certain viruses or illnesses, such as a cold or flu


  • Obese people


  • People with allergies, especially to cats


  • People who are exposed to environmental irritants, such as tobacco smoke, mold, dust, feather beds, or perfume. Irritants that bring on asthma symptoms are called "asthma triggers." Asthma brought on by workplace triggers is called "occupational asthma."


Next: What is the difference between childhood asthma and adult-onset asthma? »

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What is obesity?

The definition of obesity varies depending on what one reads, but in general, it is a chronic condition defined by an excess amount body fat. A certain amount of body fat is necessary for storing energy, heat insulation, shock absorption, and other functions. The normal amount of body fat (expressed as percentage of body fat) is between 25%-30% in women and 18%-23% in men. Women with over 30% body fat and men with over 25% body fat are considered obese.

The calculation of body mass index (BMI) has also been used in the definition of obesity. The body mass index (BMI) equals a person's weight in kilograms (kg) divided by their height in meters (m) squared. Since BMI describes body weight relative to height, it is strongly correlated with total body fat content in adults. "Obesity" is defined as a BMI of 30 and above.

How common is obesity?

Obesity has reached epidemic proportions in the United States. One i...

Read the Obesity article »










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