What is the common link between asthma and atopic dermatitis?

The common link between asthma and atopic dermatitis is their genetic predisposition. Both conditions are part of the atopic march, where individuals with a family history of allergic diseases are more likely to develop these conditions. Genetic factors contribute to the immune system's response, leading to inflammation and hypersensitivity to various allergens.

This predisposition suggests that certain genes may influence the likelihood of developing various allergic conditions, including asthma, atopic dermatitis, allergic rhinitis, and food allergies. It highlights the shared pathophysiological mechanisms underlying these diseases, particularly those related to the immune system.

Other options do not accurately represent the primary relationship between asthma and atopic dermatitis. For instance, while obesity may exacerbate asthma symptoms, it is not a direct common link to both conditions. Antihistamines may provide relief for some symptoms of atopic dermatitis but are not a standard treatment for asthma. Lastly, viral infections do not serve as a common causative factor for these chronic inflammatory conditions.