What is asthma？

What is asthma

Asthma is the human body from a variety of inflammatory cells (including eosinophils, mast cells, T lymphocytes, etc.) to participate in the chronic airway inflammation. This susceptibility to the inflammation of the in vitro in a variety of stimulating factor airway hyperresponsiveness, and caused a narrow airway. Clinical performance for the repeated attacks of breathing, breath and difficulty breathing, coughing or chest tightness and other symptoms, often at night and (or) early morning attack, aggravated, there are often widely varied irreversible airflow limitation, the majority of patients can To alleviate or mitigate treatment. Improper treatment, may also have a narrow airway is not reversible, so a reasonable control is essential.
At present there are 160 million patients worldwide, national prevalence rate of 1% to 13%, China's prevalence rate of 1% to 4%. Children generally believed that the incidence rate of more than adults, male and female adult prevalence rate of roughly the same, about 40 percent of patients have family history. Developed countries than in developing countries, urban than rural.