These are factors that cause the immune system of the body to overreact to certain things that include; pollen, dust mites and animal dander that in most human being are harmless.
Genetic and environmental factors
Studies show that most of the genes are either linked or involved in the compartment of asthma and some of its features. The complexities of genes’ involvement are observed by the linkages to certain phenotypic features.
The two environmental factors that have come out as the most significant in the development, severity and most probably persistence of asthma are viral respiratory infections and airborne allergens (Anil and Zhang, 2011).
It is characterized with cleanness in the environment that people live, stay and play. In an effort to keep these environments, clean has led to the use of antimicrobial products, which in turn has led to the interfering of the natural course of human being immune system development. That is, the chemicals eliminate the infectious agents in the environment that assist in testing and strengthening immunity. According to Anil and Zhang (2011), the frequent use of cleaning products has cause high risk of getting asthma, especially the aerosol-based ones.