Causes of Asthma

Pollens: Although pollination occurs during the spring, variations according to different climates and types of plants. Symptoms are usually detected at concentrations above 50 grains of pollen per cubic meter of air. The small size favors pollen remaining airborne for long periods and walk long distances to penetrate the breathing passages.
Prevails in Spain grass pollen, olive trees in the south and Parietaria in the Mediterranean area. Dust mites: These microscopic parasites that live in house dust and feed on skin flakes and other debris. They need to develop precise conditions: temperature 25 ° C and 85 percent humidity.
In Spain the most important are Dermatophagoides pteronyssinus and Dermatophagoides farinae.

• Food : Asthma episodes related to food are common during childhood and are accompanied by other symptoms such as hives and vomiting, so they tend to be confused with food poisoning. Products that cause major reactions are milk, eggs and fish. In adulthood, this type of asthma is less common.
• Fungi : Certain fungi produce allergens that settle on their spores and the release of these depends on the humidity, temperature and the presence of organic matter in their environment, such as garbage or shower curtains. Times more favorable for its development are spring and fall, the most common and highlight the alternaria, the Cladosporium, Penicillium, Aspergillus and mucor.