Asthma can be well controlled by avoiding or managing triggers for asthma and using asthma medicines correctly. Most asthma medicines are inhaled into the lungs, but sometimes tablets, syrups or injections must be used. The three main types of asthma medicines are called relievers, preventers and symptom controllers. Asthma is an inflammation of the airways that makes breathing difficult. It affects more than two million Australians. Asthma cannot be cured, but can be well controlled with medicines, allowing a person with asthma to live a normal and active life, free of symptoms. People with asthma have sensitive airways in their lungs. Certain triggers cause the muscles around their airways to tighten, the lining of their airways to become inflamed and swollen and extra mucus to be secreted, making air passages narrower and breathing difficult.