An asthma flare begins when the cells lining the airways become irritated by something the body reacts to strongly. This can be dust, smoke, cold air, pollen or a respiratory infection. These lining cells are very sensitive and respond by releasing chemical signals as soon as they detect a trigger. The signals draw immune cells to the area and cause fluid to collect in the airway wall. This swelling makes the airway passage smaller and starts the first stage of breathing difficulty. As the irrit
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