ASA Guidance for swimmers who have asthma

Why is swimming good for me?

Regular swimming has a wide range of beneficial health effects, such as improved cardio-respiratory fitness, muscle strength and flexibility. Swimming also has positive psychological effects by relieving stress and tension. Virtually everyone can benefit from these effects, as long as some basic precautions are taken when attending the pool. Here are a few tips especially relevant to those who have asthma.

What is asthma?

Asthma is a very common; typically it causes a cough, a wheeze, a tight chest and shortness of breath. These symptoms are often brought on by irritating fumes, exercise and cold air. Having a cold or other respiratory infection usually makes asthma worse and the effects may continue for some weeks. In almost all cases, however, asthma is easily manageable with simple treatments.

Is the swimming pool environment safe?

There is no reason why almost all people with asthma should not go swimming. Based upon current scientific knowledge, there is no strong evidence that recreational swimming can cause asthma or make your asthma worse. In fact, many people with asthma find that the warm humid atmospheres in swimming pools can make their breathing a little more comfortable.

What about the chlorine?

Depending upon the condition of the water in your local pool, irritation to the eyes, nose and lungs may occur. The condition of the water is affected by factors such as the control of the pH of the water and the disinfectant (normally chlorine), the hygiene habits of bathers and the standard of the water treatment plant and its operation and maintenance.

If you have asthma, ensuring that it is well-controlled is integral to an enjoyable swim. Inappropriate water treatment and chlorine by-products (such as chloramines) can sometimes heighten lung irritation and increase the risk of an asthma attack. Generally, you should be ‘ruled by your senses’. If there are strong and unpleasant smells and after about 3 minutes of being in the pool area, you find them obnoxious (known as the ‘nose test’), you should make the pool management aware of this and not spend a long period of time in the water.

If you find that swimming makes your asthma worse then it may be a sign that you need better treatment; you should discuss this with your family or hospital doctor. Even if your treatment is correct, you may find it helpful to take two puffs of your reliever inhaler 10-15 min before getting in the water. And if you are having a bad time with your asthma or if you have a very bad cold, it is advisable not to go swimming until you have fully recovered.

What if I train in the pool every day?

If we take the Olympic Games in Beijing as an example, the use of some asthma inhalers was highest among swimmers, synchronized swimmers and triathletes. These swimmers spend more time in the water than anyone else and the long training hours mean that their lungs are exposed to larger doses of chloramines. Competitive swimmers who have asthma should therefore take a few extra precautions:

  1. Always start your session with a proper warm-up (as this usually reduces the breathing discomfort and the risk of a severe asthma attack)

  2. Always carry a reliever inhaler with you, and

  3. Always talk to your family or hospital doctor if you feel your breathing has deteriorated and/or your symptoms become more frequent. As a general rule, if you start using your reliever inhaler more than 5 times a week, it might be time for a medical check-up.

Remember: numerous successful elite swimmers have asthma. As long as your asthma is under good control, it won’t hinder your sport performance.

What if I get an asthma attack in the pool?

If you have an asthma attack while you are swimming, get out of the pool, rest and take your reliever inhaler immediately. If the situation fails to improve quickly, then make the pool lifeguard or nearest members of staff aware of the situation and ask them to assist.

Where to read further:

The Institute of Sport and Recreation Management gives guidance to the pool industry at where you should read ISRM Information Ref- 348: 01/09 which provides a synopsis of current research into swimming and asthma

The Pool Water Advisory Treatment Group also gives guidance to the pool industry, in particular how to administer non-irritant water and air to the pool users. Their web site can be found at

The Committee on the Medical Effects of Air Pollutants is a Department of Health Committee that advises on all aspects of air pollutants. See COMEAP’s statement on ‘Asthma and exposure to chlorine and other associated reaction products at swimming pools’ at You will then need to click on ‘Statements and reports’ in the left hand column and the statement will then be downloadable.

Where to go for further advice:

The first point of contact should always be your own doctor.

For questions relating to swimming:

Customer Service Department

Amateur Swimming Association

Harold Fern House

Derby Square


Leics., LE11 0AL

Tel, 01509 618700

Members of ASA Advisory Panel on Swimming and Asthma:

  • Peter Burney MA MD FRCP FFPH FMedSci, Professor of Respiratory Epidemiology and Public Health, Imperial College London
  • Paul Cullinan MD, FRCP, Professor in Occupational and Environmental Respiratory Disease, National Heart & Lung Institute
  • Andy Elphick, BSc, Chemist and Technical Advisor to the Pool Water Treatment Advisory Group
  • Pascale Kippelen, PhD, Exercise Physiologist, School of Sport and Education, Brunel University
  • Dr Phil Penny, Occupational Health and Safety Physician and member of the ASA Medical Committee