When asthma symptoms appear in adults 20 years of age or older, it is referred to as adult-onset asthma. Exposure to allergens, infection, or irritants such as cigarette smoke, chemicals, mold, or other substances commonly found in the person’s environment may trigger the first asthma symptoms in an adult.

Although genetic mutations that lead to CVID have been identified, the exact cause and genetic inheritance pattern of CVID is unknown in most cases. Both males and females are affected. It is one of the most common forms of primary immunodeficiency disease (PIDD), and the severity of symptoms varies from one person with the disease to another.

Common reactions include:

• gastrointestinal problems
• headaches
• coughing
• rashes
• muscle aches
• fevers