Asthma is a chronic illness that causes breathing difficulties. It often runs in families and can be triggered by allergens like pollen, mold, and animals or irritants like smoke and perfume. Common symptoms include coughing, especially at night, and frequent chest colds. There are two types of asthma - bronchial asthma cannot be cured while childhood asthma can be cured. People with asthma should take medicines and see their doctor regularly to manage their condition.