House dust mites, which live in mattresses, pillows, carpets and soft, furry toys. Pollens in some flowers, plants and grasses. Moulds, which are often found in damp areas in bathrooms and kitchens. Animal fur or feathers. Some medicines, such as aspirin and pain relievers, can cause symptoms in some people with asthma.
Some herbal remedies can also cause asthma.
Exercise may trigger asthma, but medication and warm-up exercises can usually control this. Since different people react to different things, it's probably not necessary for you to avoid all of the common triggers. Your doctor will help you identify any triggers that are a problem for you. This will give you a better clue as to what to avoid. Food is not a common trigger.