The causes of childhood allergic asthma are mainly related to environmental and genetic factors. According to epidemiological surveys, about 30% to 40% of asthma patients have a family history of asthma, and about 50% to 60% have a family history of allergies.
On the other hand, allergic asthma may be caused by external factors, and allergies may occur after the baby is exposed to allergens. The most common allergens are mites and dust mites.
In asthmatics, 30% to 40% of patients can detect allergens. Dust mites, cats and dogs, and other animal skin dirt, mold, pollen, milk, poultry eggs, silk, feathers, moths, cotton wool, fungi, etc. are all important allergens. Especially dust mites. In recent years, a large number of studies have confirmed that dust mites are closely related to bronchial asthma and are an important predisposing factor for bronchial asthma. The detection rate of dust mites is higher in warm and humid northern regions because that environment is more suitable for dust. Mite growth.