If you have asthma your airways can become inflamed, swollen and contract down with excess mucus production. Asthma often runs in families and is more likely if parents and siblings have asthma or other allergies. Children are more likely to develop asthma if their mother smoked during pregnancy or while breastfeeding. One of the most common predisposing factors for asthma are allergies to house dust mites, mould spores, pollen and pets, and sometimes food allergies.
Most people find that there are several things that can trigger their asthma.
You need to use your reliever medicines more often. You wake in the night with breathing difficulties. You have trouble keeping up your normal level of activity. There are two main treatments for asthma - relievers and preventers . These come in a variety of delivery devices called inhalers that enable you to breathe the medicine in through your mouth, directly into your lungs.