No, asthma is not hereditary, but it is commonly believed that there is a hereditary factor to the tendency of developing this condition. This means that asthma tends to run in families. If both parents don't have asthma, the chances of the children to have asthma are less than if one (commonly the mother) or both parents have asthma.
Children don't inherit asthma, but have the tendency to develop it by itself. Asthma is widely known to have various contributing factors such as the person's exposure, particularly during childhood, to viral infections, irritants, allergens, passive smoking if one or more members of the family are smokers.
Actually asthma is hereditary, but that does not necessarily mean your children will have asthma because the gene is not passed to every child. What is hereditary is the super-sensitive immune response. Essentially the asthmatic condition is caused by a super-sensitive immune system, making the lungs over-sensitive to antigens, or non-self substances. The gene that causes this problem has existed for generations and has survival value. Asthmatics have demonstrably lower rates of cancers and non-malignant growths, for example. Some forms of asthma have developed after exposure to certain industrial chemicals irritants or a virus, but again, there is a genetic component.
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