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  1. Asthma - Symptoms and causes - Mayo Clinic

    • Asthma is a condition in which your airways narrow and swell and may produce extra mucus. This can make breathing difficult and trigger coughing, a whistling sound (wheezing) when you breathe out and sho… See more

    Symptoms

    Asthma symptoms vary from person to person. You may have infrequent asthma attacks, have symptoms only at certain times — such as when exercising — or have sympt… See more

    Mayo Clinic
    Causes

    It isn't clear why some people get asthma and others don't, but it's probably due to a … See more

    Mayo Clinic
    Risk Factors

    A number of factors are thought to increase your chances of developing asthma. They include: 1. Having a blood relative with asthma, such as a parent or sibling 2. Having ano… See more

    Mayo Clinic
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