Asthma is a common long-term condition that can be well controlled in most children. The severity of asthma symptoms varies between children, from very mild to more severe.

In the UK, over 1.1 million children have asthma. It is more common in young boys than young girls. However, this changes as children get older and, after puberty, asthma is more common in girls.

During the teenage years, the symptoms of asthma may disappear. However, asthma can return in adulthood. If the childhood symptoms of asthma are moderate to severe, it is less likely that the condition will get better in adolescence and more likely that it will return later in life.

The cause of asthma is not fully understood. It is known that asthma often runs in families and a child is more likely to have asthma if one or both parents have the condition.

What is asthma?

Asthma affects the airways, the small tubes that carry air in and out of the lungs (known as the bronchi). If your child has asthma, the airways of their lungs are more sensitive than normal. When your child comes into contact with something that irritates their lungs, known as a trigger, their airways become narrow, the lining becomes inflamed, the muscles around them tighten, and there is an increase in the production of sticky mucus or phlegm. This makes it difficult to breathe and causes wheezing, coughing, shortness of breath and can make the chest feel tight.

A sudden, severe onset of symptoms is known as an asthma attack, or an acute asthma exacerbation. Asthma attacks can sometimes be managed at home but may require hospital treatment. They are occasionally life threatening.

Common triggers

A trigger is anything that irritates the airways and causes the symptoms of asthma. Everyone’s asthma is different and people may have several triggers.

The most common trigger of an asthma attack is having an upper respiratory tract infection, such as a cold or flu. Other common triggers include:

• exercise, especially in cold weather
• an allergy to and contact with house dust mites, animal fur, grass and tree pollen
• exposure to air pollution, especially tobacco smoke

The common symptoms of asthma include:

• feeling breathless 
• wheezing (there may be a whistling sound when your child breathes)
• coughing, particularly at night
• tightness in the chest

Symptoms vary between people and children may have one or more of these symptoms. If symptoms become worse during the night or with exercise, your child's asthma may not be well controlled. Take your child to see their doctor or asthma nurse.

When asthma gets worse

When symptoms of asthma get significantly worse, this may be the start of an asthma attack. The symptoms of a severe asthma attack sometimes develop slowly, taking 6-48 hours to become serious. For some people, asthma can get worse very quickly.

Be aware of any signs of worsening asthma in your child. These may include:

• an increase in symptoms, such as your child becoming more wheezy, tight chested or breathless 
• the reliever inhaler (usually blue) not helping as much as usual
• a drop in peak expiratory flow rate (see the Asthma in children - diagnosis for more information).

If you notice your child's symptoms are getting worse, do not ignore them. Contact your GP or asthma clinic.

What to do in a severe asthma attack

Symptoms of a severe asthma attack include:

• the reliever inhaler does not help symptoms at all 
• the symptoms (wheezing, coughing, tight chest) will be severe and constant
• breathing very fast and too breathless to complete a sentence in one breath or too breathless to talk or feed 
• a racing pulse
• feeling agitated or restless 
• lips or finger nails may look blue

Call 999 for an ambulance if your child has severe symptoms of asthma.

You may be advised to give extra doses of the reliever inhaler while you are waiting for the ambulance.

There is no single known cause of asthma. However, certain factors may increase the likelihood of your child developing asthma.

These factors can be due to your child’s genes or their environment, particularly in early life.

Which children are at risk of developing wheezing and asthma?

Some known factors increase the likelihood of developing wheezing and asthma, including:

• a family history of asthma or other related allergic conditions (known as atopic conditions) such as eczema, hay fever or a food allergy 
• developing another atopic condition such as eczema, hay fever or a food allergy
• having acute bronchiolitis (a lung infection, common in babies, that is caused by a virus )
• being exposed to tobacco smoke, particularly if the child's mother smokes during pregnancy
• being born prematurely

Want to know more?

• Asthma UK: What causes asthma? 

Asthma triggers

The symptoms of asthma can have a range of triggers, but they do not affect everyone in the same way. Once you know what your child’s asthma triggers are, you can try to avoid them.

• Upper respiratory tract infections - these are the most common trigger of asthma in children. They affect the nose throat and windpipe and are often caused by viruses (colds and flu).
• Exercise, particularly running outdoors in cold weather, is a very common trigger of asthma in children.
• Allergens, such as pollen, dust mites and animal fur or feathers, can trigger asthma in children who are allergic to them.
• Airborne irritants, such as cigarette smoke, chemical fumes and atmospheric pollution, may trigger asthma.
• Weather conditions, including a sudden change in temperature, cold air, windy days, poor air quality and hot, humid days, are all known triggers for asthma.
• Indoor conditions, such as mould or damp and occasionally chemicals in carpets and flooring materials, may trigger asthma.
• Emotional factors, such as stress or laughing, can trigger asthma.
• Food allergies - some children have allergies to nuts or other foods. A child with a food allergy may have an asthma attack as part of an allergic reaction to a food. When this is severe, it is known as anaphylaxis.
• Foods containing sulphites - sulphites are naturally occurring substances found in some food and drink. They are also sometimes used as a food preservative. Food and drinks that are high in sulphites include concentrated fruit juice, jam, prawns and many processed or pre-cooked meals. Most children with asthma will not have this trigger.
• Medicines, such as the class of painkillers called non-steroidal anti-inflammatory drugs (NSAIDs), which includes aspirin and ibuprofen, occasionally trigger asthma in children. Children under 16 years of age should not be given aspirin.

Want to know more?

• Asthma UK: Asthma triggers A-Z.
• Food Standards Agency: Intolerance to additives.  

What happens during an asthma attack?

During an asthma attack:

• The bands of muscles around the airways tighten.
• There is increased inflammation in the linings of the airways and they become swollen.
• The airways produce sticky mucus or phlegm, which can further narrow the airways.

This narrows the passages of the airways, making it more difficult for the air to pass through (in other words, making it more difficult to breathe). This can cause the characteristic wheezy noise. However, not everyone with asthma will wheeze. In a life-threatening attack, there may not be a wheezy sound.

An asthma attack can happen at any time. However, there are usually warning signs for a couple of days before, such as symptoms getting worse, especially during the night, and an increased need to use the reliever inhaler.

Asthma can sometimes be life threatening. See Childhood asthma - treatment for more information about how to manage your child’s asthma. Speak to your doctor or asthma nurse for further advice.

If your child or someone else is having a severe asthma attack and they are unable to breathe, dial 999 immediately to request emergency medical treatment.

Want to know more?

• Asthma UK: Information for parents.

Asthma can be difficult to diagnose in young children because many other conditions can cause similar symptoms.

Most children develop the symptoms of asthma by the time they reach school age. Some children also have other allergic (atopic) conditions such as eczema and hay fever.

There is no simple test to diagnose asthma, but certain combinations of symptoms and signs make it likely that your child has asthma.

Your GP will ask about your child's symptoms and listen to their chest. They will want to know when and how often your child has symptoms and if you have noticed anything that might trigger them. The GP will also ask about your child's medical history and whether there is a history of allergic conditions in your family.

If your GP suspects your child may have asthma, a number of tests can be carried out to confirm the diagnosis.

Sometimes, children may be given an asthma inhaler as a trial treatment. If this helps their symptoms, the child probably has asthma. However, asthma medicines can be relatively ineffective in infants and young children, so a negative response may not definitely rule out asthma.

Spirometry

To assess how well your child’s lungs work, a breathing test called spirometry is carried out. At the GP surgery, this test can only be done reliably in children over the age of five.

Your child will be asked to breathe into a machine called a spirometer. The spirometer takes two measurements: the volume of air that your child can breathe out in one second (called the forced expiratory volume in one second or FEV₁) and the total amount of air that your child can breathe out (called the forced vital capacity or FVC).

Your child may be asked to do the test a few times to get a consistent reading.

The readings are compared with normal measurements for children of your child’s age. This will show if your child’s airways are obstructed.

Sometimes, an initial set of measurements is taken, and then your child is given a medicine to open up the airways (a reliever inhaler). Another reading is then taken. If the reading is much higher after taking the medicine, this suggests your child has asthma.

Peak expiratory flow rate test

A small hand-held device, known as a peak flow meter, can also be used to measure whether the lung airways are narrowed. The peak flow meter measures the highest flow of air that we can blow out of our lungs during one breath. This is called the peak expiratory flow rate (PEFR).

You may be given a peak flow meter to take home and a diary to record measurements of your child’s peak flow. Your child’s diary will also have a space for you or your child to record their symptoms. This will help you recognise when your child’s asthma is getting worse.

The PEFR test is only suitable for children who are over five years of age.

Other tests

Some children may need more tests. The additional tests may confirm the diagnosis of asthma or may help diagnose a different condition that causes symptoms similar to those of asthma. The results of these tests will help you and your doctor plan your child’s treatment.

Airway responsiveness tests

This test is used to see how the airways react when they are stimulated. The most common test of this type in children is an exercise test. Your child will blow into a peak flow meter or a spirometer and then be asked to run as hard as they can for a few minutes. After the run, the breathing tests will be repeated. A significant decrease in the measurements may indicate your child has asthma.

Tests of airway inflammation

These tests are normally done in a hospital asthma clinic.

• Phlegm sample - the doctor may take a sample of phlegm to check whether there is inflammation in the lungs.
• Nitric oxide concentration - as your child breathes out, the level of nitric oxide in the breath is measured. A high level of nitric oxide can be a sign of airway inflammation.

Tests of allergy

Skin testing or a blood test can sometimes help establish whether your child’s asthma is associated with specific allergies, such as allergies to dust mites, pollen and foods.

Personal asthma action plan

As part of the initial assessment, you and your child should be encouraged to draw up a personal asthma action plan with your GP or asthma nurse. The plan includes information about your child's asthma medicines. If your child has been admitted to hospital because of an asthma attack, you should be offered a written action plan (or the opportunity to review an existing action plan) before you go home.

As your child gets older, it is important for them to be able to recognise the signs and symptoms of their asthma, and how to effectively manage their condition. Both you and your child should be shown how to recognise when their symptoms are getting worse and the appropriate steps to take. You should also be given information about what to do if they have an asthma attack.

You and your child should review their personal asthma action plan with their GP or asthma nurse at least once a year, more frequently if their symptoms are severe or not well controlled.

As part of their asthma management, your child may be given a diary card and sometimes a peak flow meter to monitor their symptoms and the effects of treatment.

Want to know more?

• Your health, your way: What is self-care?
• Asthma UK: Personal asthma action plan.
• Asthma UK: Controlling your child’s asthma.

Taking asthma medicines

Inhalers

Asthma medicines are usually given by inhalers. These are devices that deliver the drug directly into the airways through your child’s mouth when your child breathes in. Inhaling a drug is an effective way of taking an asthma medicine as it goes straight to the lungs, with very little ending up elsewhere in the body. This means a smaller dose can be taken with fewer side effects.

Spacers

Some people, and most young children, find using inhalers difficult. A spacer can help. Spacers are large plastic or metal containers that have a mouthpiece at one end and a hole for the inhaler at the other. The medicine is ‘puffed’ into the spacer by the inhaler and it is then breathed in through the spacer mouthpiece. Children under the age of three have the spacer attached to a facemask rather than a mouthpiece, to make it easier for them to breathe in the medicine. Spacers are also good for reducing the risk of thrush in the mouth or throat, which is an occasional side effect of inhaled steroid medicines. Steroid inhalers should always be taken with a spacer.

Want to know more?

• Asthma UK: Using your inhalers. 

Reliever inhalers

Reliever inhalers are taken as soon as asthma symptoms develop. The inhaler, also known as a reliever, contains a medicine called a short-acting beta2-agonist. This will relieve the symptoms of asthma. Relievers work fast by relaxing the muscles surrounding the narrowed airways. This allows the airways to open wider, making it easier to breathe. Examples of reliever medicines include salbutamol and terbutaline. They are generally safe medicines with few side effects.

If your child's symptoms are mild and do not occur often, they will just be given a reliever inhaler. It is usually blue.

Want to know more?

• Asthma UK: Reliever inhalers.

Preventer inhalers

Preventer inhalers work over time to reduce the amount of inflammation and ‘twitchiness’ in the airways and prevent asthma attacks occurring. Your child will normally be recommended to take their preventer inhaler every day to prevent symptoms. Your child will need to use their preventer inhaler daily for some time before they gain the full benefit. They should still use their reliever inhaler to relieve symptoms.

The preventer inhaler contains a medicine called an inhaled corticosteroid. Examples of preventer medicines include beclometasone, budesonide and fluticasone. Preventers are usually brown, red or orange.

Preventer treatment is normally recommended if your child:

• has asthma symptoms more than twice a week
• wakes at least once a week due to asthma symptoms
• has to use a reliever inhaler more than twice a week

Inhaled corticosteroids (preventers) occasionally cause fungal infections (oral thrush) in the mouth and throat. Your child should rinse their mouth thoroughly after inhaling a dose. For more information on side effects, see below.

Want to know more?

• Asthma UK: Preventer inhalers.

Other treatments and ‘add-on’ therapy

Long-acting reliever inhaler

If your child's asthma does not respond to treatment, the doses of their preventer inhaler can be increased if agreed with their healthcare team. If this does not control your child’s asthma symptoms, you may be given a different inhaler containing a medicine called a long-acting bronchodilator or long-acting beta2-agonist (LABA). Examples of LABAs include formoterol and salmeterol. LABAs are given in an inhaler that combines an inhaled steroid and a long-acting bronchodilator in a single device. It is known as a combination inhaler. LABAs work in a similar way to short-acting relievers, but their effect lasts for up to 12 hours. Examples of combination inhalers include Seretide and Symbicort. These are usually purple or red and white.

If your child is under two years of age and has frequent symptoms, they should be referred to a specialist in children's asthma.

Other preventer medicines

If treatment of your child’s asthma is still not successful, additional preventer medicines will be tried. Two possible alternatives are:

• Leukotriene receptor antagonists - this medicine, in the form of a chewable tablet or granules, can be added to food and works by blocking a chemical reaction that can lead to inflammation of the airways.
• Theophyllines - this medicine, in the form of a tablet, helps widen the airways by relaxing the muscles around them.

In rare cases, if your child’s asthma is still not under control, they may be prescribed regular oral steroids (steroid tablets). This treatment should be supervised by a specialist in children's asthma (a respiratory paediatrician). Long-term use of oral steroids carries possible serious side effects, so it is only used once other treatment options have been tried. See below for more information on the side effects of steroid tablets.

Occasional use of oral steroids

Most children only need to take a course of oral steroids for three to five days to treat an asthma attack.

Want to know more?

• Asthma UK: Medicines for your child.
• Asthma UK: Other treatments and ‘add-on’ therapies.

Side effects of treatments

Your doctor or nurse will discuss with you the need to balance the control of your child's asthma with the risk of side effects, and how to keep side effects to a minimum.

Side effects of relievers

Relievers (short-acting beta2 agonists) are safe and effective and have very few side effects. The main side effects include a mild shaking of the hands, headache and muscle cramps. These usually only happen with high doses of reliever inhalers and do not last very long.

Side effects of preventers

Preventers (corticosteroids), which may be given for asthma as tablets, by injection or through inhalers, can cause a range of side effects. However, when a low-dose corticosteroid is given as a preventer using an appropriate inhaler device, side effects are rare. One side effect of an inhaled steroid given regularly as a preventer is a fungal infection (oral candidiasis or thrush) of the mouth or throat. Very occasionally, children also develop a hoarse voice. Using a spacer can help prevent these side effects. Your child should also rinse their mouth or clean their teeth after taking their preventer inhaler.

During the first year of treatment with an inhaled steroid reliever, there is often a slight slowing of growth. However, with standard doses, children achieve their expected normal adult height. Similarly, regular use of standard doses of a steroid inhaler for several years does not increase the risk of thinning of the bones or of bone fractures.

If your child uses a preventer inhaler for a long time at high doses, there is a small risk of the more serious side effects associated with long-term oral steroid use (see side effects of steroid tablets, below). Children receiving long-term treatment with high doses of an inhaled steroid should be reviewed in a hospital clinic by a specialist respiratory paediatrician.

Side effects of add-on therapy

Some regular treatments for asthma are added when preventer treatment with an inhaled corticosteroid alone does not fully control your child’s symptoms.

Long-acting relievers (long-acting beta2 agonists or LABAs) may cause similar side effects to short-acting relievers: a mild shaking of the hands, headache and muscle cramps. Some studies have suggested that there may be a small increased risk of serious side effects, including severe asthma attacks and death, when using long-acting relievers. Your GP can discuss the risks and benefits of this medication with you. As with all asthma treatment, your child should be monitored and reviewed regularly. If you feel your child is not benefiting from the use of the long-acting reliever, it should be stopped.

Leukotriene receptor agonists seldom cause side effects but have been known to cause stomach upsets, thirst, headache and occasionally nightmares.

Theophylline tablets are an effective add-on treatment for asthma but commonly cause side effects in children, including nausea, vomiting and stomach upset, headaches, irritability and sleep disturbance.

Side effects of steroid tablets

Children taking oral steroids for more than three months, or who take frequent courses of oral steroids (3-4 times a year), are at risk of side effects. The side effects can include:

• slowing of growth
• fragile bones (osteoporosis)
• suppression of the body’s normal steroid production 
• high blood pressure (hypertension) 
• diabetes 
• cataracts (an eye disorder where the lens becomes clouded)

It is rare for children to need long-term treatment with steroid tablets. Such children should be reviewed at a hospital clinic by a paediatric respiratory specialist. They will require regular examinations to check for the development of these side effects and careful monitoring of their growth in height and weight. 

Want to know more?

• Asthma UK: Side effects of asthma medicines.
• Asthma UK: Steroids and your child.

Asthma attacks

Your child’s personal asthma action plan will help you and them to recognize the symptoms of an asthma attack, what to do and when to seek medical attention.

Treatment of asthma attacks usually involves taking several extra doses of their reliever inhaler (which is usually blue). If the symptoms of your child's asthma attack worsen, they may need hospital treatment.

If your child is admitted to hospital with an asthma attack, they will be given high doses of reliever treatment by inhalation and a course of steroid tablets (or occasionally injections). They may also need to be given oxygen to bring their asthma under control.

After an asthma attack, your child's personal asthma action plan will need to be reviewed and the reasons for the asthma attack identified so that, if possible, an attack can be avoided in the future.

Want to know more?

• Asthma UK: What to do in an asthma attack.

Complementary therapies

A number of complementary therapies have been suggested for the treatment of asthma, including:

• breathing exercises 
• traditional Chinese medicine 
• acupuncture 
• ionisers (a device that uses an electric current to charge or ionise molecules of air) 
• the Alexander technique (a training programme designed to change the way you move your body) 
• homoeopathy 
• dietary supplements

There is little evidence that any of these treatments, other than certain breathing exercises, are of benefit for children with asthma.

There is good evidence that breathing exercises taught by a physiotherapist, yoga and the Buteyko method (a technique involving shallow breathing) can improve symptoms and reduce the need for reliever medicines in some people, although most of the work in this area has been done in adults and not children.

Want to know more?

• Asthma UK: Complementary therapies.

Daily life

With the right treatment and management, asthma should not restrict your child’s life.

Sleeping

Symptoms at night are an indication that asthma is poorly controlled. Your child might wake up some nights coughing or with a tight chest. Poor sleep can affect your child’s behaviour, concentration and their ability to learn.

Achieving good control of asthma using the treatment your GP recommends will reduce symptoms, which means your child should sleep better.

Exercise

Children and young people should do at least 60 minutes (1 hour) of aerobic activity every day, which should include a mix of moderate-intensity (i.e. fast walking) and vigorous-intensity (i.e. running) activities. Children generally want to be active, so if they are reluctant to do exercise it may be an indication that their asthma is not fully controlled.

If your child has asthma symptoms during or after exercise, speak to their doctor or asthma nurse. It is likely that they will review your child's general symptoms and personal asthma plan to make sure their asthma is under control.

The doctor or asthma nurse may also tell your child to:

• Use a reliever inhaler (usually blue) 10-15 minutes before they exercise and again after two hours of non-stop exercise or when they finish.
• Start with warm-up exercises. 
• Try to structure their exercise plan around short-burst activities.
• Exercise in humid environments. 
• Breathe through their nose if possible to avoid excessively rapid and deep breathing (hyperventilation).
• Cool down correctly once exercise is finished.

Keeping well

Some medical conditions, such as rhinitis and sinusitis, are known to aggravate asthma. In children with asthma and allergic rhinitis, treating the allergic rhinitis as well as the asthma can help bring the asthma under control.

Want to know more?

• Asthma UK: Healthy lifestyles.

Know their triggers

It is important, where possible, to identify the triggers of your child's asthma by making a note of when symptoms get worse and, sometimes, using their peak flow meter during exposures to certain situations. Some triggers, such as air pollution, viral illness or certain weather conditions, can be hard to avoid. Other triggers, such as dust mites, fungus spores or pet fur, can sometimes be avoided.

Want to know more?

• Asthma UK: Asthma triggers A-Z.

Education

Most children with well-controlled asthma can learn and participate in their school’s activities completely unaffected by their condition. However, it is important to tell the school if your child has asthma and to make sure that they have information about your child’s asthma medicines.

You will need to supply the school with a reliever inhaler for your child to use if they experience symptoms during the school day.

Staff at the school should be able to recognise worsening asthma symptoms and know what to do in the event of an attack, particularly staff supervising sport or physical education.

Your child’s school should have an asthma policy in place, which you can ask to see.

Want to know more?

• Asthma UK: Your child at school.
• Asthma UK: Nursery and childcare.
• Asthma UK: Schools and early years.

Complications of asthma

Quality of life

Poorly controlled asthma can have an adverse impact on your child's quality of life. The condition can lead to:

• fatigue
• underperformance or absence from school
• psychological problems, including stress, anxiety and depression

Children may also feel excluded from their school friends if they cannot take part in games, sports and social activities.

If you feel that your child's asthma is seriously affecting their quality of life, contact your GP or asthma clinic. Your child's personal asthma action plan may need to be reviewed to control their asthma better.

Death

Asthma is the most common long-term condition in children and it can be life threatening. In the UK in 2008, 29 children under the age of 14 died from asthma. Your child’s personal asthma action plan will help you and them recognise the symptoms of an asthma attack, what to do and when to seek medical attention.

Get in touch with others

You may find it helpful to talk about your experience of your child’s asthma with other people in a similar position. Asthma UK provides a forum for parents and carers to discuss their experiences.

Want to know more?

• Chat about asthma online at Asthma UK’s forum.

Tashaurn, his mother and his nurse talk about living with childhood asthma.

Around one child in ten in the UK has asthma. Find out what can trigger it, the treatment options and how your child can be active despite having asthma.

The list below is a combination of the and brand names of medicines available in the UK. Each name provides a link to a separate website (Medicine Guides) where you can find detailed information about the medicine. The information is provided as part of an on-going medicine information project between NHS Direct, Datapharm Communications Ltd and other organisations.

The medicines listed below hold a UK licence to allow their use in the treatment of this condition. medicines are not included.

The list is continually reviewed and updated but it may not be complete as the project is still in progress and guides for new medicines may still be in development.

If you are taking one of these medicines for a different condition, or your medicine for this condition is not mentioned here at all, speak to your prescriber, GP or pharmacist, or contact NHS Direct on 0845 46 47.