Is Atopic Dermatitis a Familial Disease?

AD is a familial disease, though the exact way it passes from parents to children is unclear. If one parent has AD, or any of the other atopic diseases (asthma, hay fever), the chances are about 50% that the child will have one or more of the diseases. If both parents are atopic, chances are even greater that their child will have it. However, the connection is not an absolute one: As many as 30% of the affected patients have no family members with any of these allergic disorders.