A good way to identify your triggers is to keep a diary and write down any symptoms (such as cough, wheeze, difficulty breathing, peak flow readings) together with any potential triggers you've been exposed to (such as traffic fumes, a change in the weather, a cold or cough).

Show these notes to your doctor or practice nurse. You may also wish to ask your doctor about allergy testing as it may be useful.

Knowing how to avoid your triggers can help you to reduce the likelihood and intensity of an attack.

If your asthma is caused by an allergy, you may be able to find out what you're allergic to by having special tests and then taking practical steps to avoid the allergen.

Quit smoking. This is especially important if you're a parent or planning to have a baby. Children whose mothers smoke are more likely to have asthma.

Cold air
This is a non-specific trigger. Changes in air temperature, especially going from a warm room into cold air outside, often provoke symptoms. You could try to do the following: take a couple of puffs of your reliever before going outside cover your mouth and nose with a scarf use your preventer exactly as prescribed to reduce the risk of attacks due to cold air

Drugs
Certain prescription and over-the-counter drugs may trigger asthma attacks. They include aspirin and non-steroidal anti-inflammatory drugs such as ibuprofen and beta blockers used to treat heart disease and glaucoma. You should:avoid drugs that may cause asthma symptoms always remind your doctor about your asthma when being prescribed drugs tell the pharmacist you have asthma if you're buying over-the-counter drugs

Emotions
Crying, getting excited or upset, and even laughing can all trigger symptoms, especially in small children. Using your medicines as recommended by your doctor will help you avoid problems.

House dust mites
These tiny animals live on discarded flakes of human skin. Although some people with asthma react to the mites themselves, most are sensitive to the layer of protein that covers the mites' faeces.

Old sofas, armchairs, mattresses and fitted carpets all harbour mites, which thrive in the warm, damp atmosphere of today's centrally heated homes.

Although it's impossible to eliminate house dust mite dung entirely, there are many things you can do to reduce it:

Hard floors, such as lino, wood or tiles, are easier to clean and keep dust free than carpets. Rugs should be washed regularly and hung out to dry in the sunshine. Special mattress and pillow covers are available. Wash blankets and duvets regularly and hang outside to dry. Air your bedroom daily by opening windows to reduce moisture levels and wash curtains regularly. Soft toys should be washed and dried (preferably) in a tumble dryer. Placing them in a plastic bag in your freezer, one day a week, will also help keep mites at bay.

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