Give the cause and one symptom of the following diseases or disorders of the system :
Asthma

Explanation

**Step-by-Step Solution:**

1. **Understanding Asthma**:
- Asthma is a chronic condition that affects the airways in the respiratory system. In this condition, the airways become narrow or swollen, making it difficult for air to flow in and out of the lungs.

2. **Identifying the Causes of Asthma**:
- There are several factors that can trigger or cause asthma. Some of the main causes include:
- **Airborne Allergens**: Substances like pollen, dust mites, or pet dander that can cause allergic reactions.
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