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How often asthma symptoms occur may depend on how severe, or intense, the asthma is, and whether you are exposed to allergens. Some people have symptoms every day, while others have symptoms only a few days of the year.

You may have an increased risk of asthma because of your environment or occupation, your family history or genes, other medical conditions, your race or ethnicity, or your sex.

The exact cause of asthma is unknown, and the causes may vary from person to person. However, asthma is often the result of a strong response of the immune system to an allergen in the environment.

A fact sheet that summarizes the studies on the health effects of exposure to environmental (secondhand) tobacco smoke.

Dry conditions in parts of the United States increase the potential for wildfires in or near wilderness areas. Stay alert for wildfire warnings and take action to protect yourself and your family from wildfire smoke.

Learn to control your asthma.

People at High Risk of Developing Flu-Related Complications - CDC

Did you know that adults need vaccines too? If you didn’t, you are not alone.

Some people are at high risk for serious flu complications, including young children, older people, pregnant women and people with certain health conditions. Flu vaccination and the correct use of flu antiviral medicines are very important for those people.

Vaccines are recommended for all adults to help prevent getting and spreading diseases. Vaccines are especially important for those with chronic conditions, who are more likely to develop complications from certain vaccine-preventable diseases. Find out which vaccines are recommended for you.