Allergic asthma can be caused by inhalation allergens, including pollen (but also mites, dander, and other animal derivatives), viral infections, and low-molecular-weight chemicals. Food allergens are rarely involved, although some cases have been reported due to hypersensitivity to cow’s milk or other nutrients. Asthmatic attacks have also been associated with exposure to nickel, medications, and food additives.
Allergic asthma can manifest itself with real crises, during which the subject has difficulty breathing, coughing, sputum or chest tightness. The resulting bronchial obstruction is often spontaneously reversible or resolves after therapy. Asthma has a high prevalence in childhood, especially between the ages of 4 and 7, and is the most common chronic disease. However, in 20-30% of cases, the disappearance or reduction of symptoms is observed at the time of puberty, especially in males.
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