When a doctor makes a diagnosis of asthma in people older than age 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
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."