What are the causes of asthma?

The causes of asthma are:

1. Allergens:

Common allergens include the following categories:

Common substances Such as dust, dust, pollen, carpets, animal hair, clothing fibers, and even urine in the air; irritants such as cigarettes and sprays;

Foods such as shrimps and crabs, and dairy foods such as cheese , cheese, milk, etc.

Dust is a small microorganism that mostly adheres to pillows, sheets, curtains, carpets and other places. Dust excretion can cause allergic reactions in the bronchial tubes of asthmatic patients.

2. Infection:

Upper respiratory tract infections, bronchitis and colds are common factors that induce asthma. Most of these diseases are caused by viruses, which damage the patient’s respiratory tract. The mucous membrane makes the patient's trachea more sensitive to external stimuli.

3. Air pollution:

There are many different types of pollutants in the air. According to surveys, the incidence of asthma in developed societies is on the rise. Due to the advanced industry and transportation in developed countries or regions, air quality

is often poor. For example, sulfur dioxide emitted from factories may induce asthma. Hong Kong's air pollution is becoming increasingly serious. Recently, the air pollution index often hovers at very high levels, which undoubtedly has a negative impact on the condition of asthma patients.

4. Climate change:

Weather change is also one of the causes of asthma. Whenever the seasons change, such as between summer and autumn, or from winter to spring, the temperature Changes in humidity and air humidity can cause a sensitive reaction in the patient's respiratory tract, thus inducing asthma.

5. Substances:

Some asthma patients will have allergic reactions to certain substances, causing narrowing of the respiratory tract and triggering asthma. In addition, some substances have adverse effects on almost all asthma patients. For example, "beta blockers" used to treat heart disease and high blood pressure may trigger asthma and even cause death.

6. Exercise:

Strong exercise can sometimes induce asthma, because the body needs a lot of oxygen during exercise. In this case, most of us will breathe through the mouth. The inhaled air does not pass through the respiratory tract, so it will be cooler and drier. It will also contain more particles, so inhaling a large amount will easily cause disease.

7. Mental and Emotional:

Some asthma patients may also have attacks when they are emotionally excited. For example, when laughing and making a fuss, we need to take a deep breath. It may cause narrowing of the respiratory tract and induce asthma.