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Largest study to date of rare genetic variants and asthma risk finds few associations. Despite a strong suspected link between genetics and asthma, commonly found genetic mutations account for only a small part of the risk for developing the disease -- a problem known as missing heritability.
What Is Asthma? Asthma (pronounced: AZ-muh) is a lung condition that makes it hard to breathe. Lots of people have asthma, from young kids to the elderly. What Causes Asthma? No one knows exactly why some people develop asthma. Experts think it might be a combination of environmental factors and genes. People with asthma may have a parent or other close relative with asthma. Those who are overweight may be more likely to have it.