List the causes and sign/symptoms of asthma. 

Asthma is a chronic respiratory disease characterized by inflammation and narrowing of the airways, causing breathing difficulties. The causes of asthma are multifactorial and include genetic predisposition and environmental factors such as exposure to allergens and irritants. Some of the common causes and triggers of asthma are:

1. Allergens: Pollen, dust mites, mold spores, pet dander, and certain foods can trigger an allergic reaction in some people, leading to asthma symptoms.

2. Respiratory infections: Viral and bacterial infections of the respiratory tract can trigger _____ _________ ______ _________ _________ _______ _____ ____ ___ __________ _______ _____.
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