Mayo Clinic Minute - Signs of asthma

It's estimated that more than 334 million people around the globe have asthma. It's a chronic disease that makes it hard to breathe. Asthma often starts in childhood, but can develop in people of any age and is common in adults as well. Symptoms can range from mild to life-threatening.

Dr. James Li, a Mayo Clinic allergist, talks about signs and symptoms of asthma in this Mayo Clinic Minute.
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