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Asthma is a medical condition that causes the tubes bringing air to the lungs to become sore and swollen. This causes the affected person to wheeze and cough and experience shortness of breath. Asthma often starts in childhood but affects all ages. Over 22 million people in the United States have asthma. To learn more about the disease click on the animation. Asthma is caused by a combination of genetic and environmental factors. In rare cases, it is associated with connective tissue disorders.

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