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Home Disease Index Asthma brought on by exercise

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Overview

Causes
Symptoms
Risk Factor

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Overview

 

Asthma brought on by exercise (asthma on exercise) happens to almost all people with asthma, or at least it would if their treatment was reduced or stopped. If you have never experienced asthma when exercising it may be wise to reconsider the diagnosis. In some people it is the only symptom of their asthma. Since we all exercise, it is a potential problem for all those with asthma. However, in the vast majority it can be readily controlled with medication and other measures.




Causes

 

Nobody really knows the exact reason why asthma is brought on by exercise. The mechanism may be quite complicated and involve sensory nerves and the redistribution of blood flow throughout the lung. The process is thought to include the events outlined below.

When we exercise, we breathe faster and more heavily and this leads to the following situation:

  • the lining of the airways dries out, concentrating the contents of the cells in that area. This is called increased osmotic load.
  • the airways cool rapidly because of evaporative heat loss.
In untreated, or under-treated, asthma the lining of the airway is inflamed. The drying and perhaps the cooling of the airways act as physical triggers to cause cells in the inflamed airways to release 'constrictor' chemicals, which in turn cause muscles in the airways to contract and narrow, and give rise to the typical symptoms of asthma.

 



Symptoms

 

The symptoms of asthma on exercise, either in combination or alone, include:

  • cough, but asthma is not the only cause.
  • chest tightness and difficulty in breathing (wheezing).
  • shortness of breath (this is different from being unfit because it gets worse, not better, after exercise has finished).
  • symptoms usually begin after exercise has stopped, and are at their worst about five minutes afterwards.
  • more severe attacks may start during exercise and as a result the activity has to stop.
  • wheezing or chest tightness gradually lessens over the next 10-30 minutes if the asthma attack is untreated. Recovery can take longer if the attack is very severe.


Risk Factors

 

 

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