In fact, yes, even if the sensitivity to the most children. Indeed, allergies may also occur in adults. But can be found at any moment in life, disappear, diminish or reappear years later! Thus, epidemiology notes that dietary sensitivities and dermatitis of eczema, decrease with age, replaced by allergies caused by the consumption of some drugs or allergic rhinitis, or hay fever. If allergies sometimes appear late, it is because contact with the causative or antigen-producing material may only occur in adulthood: that is the state of sensitivities caused by the seafood (usually not favored by children or young people) or a particular drug. For example, the choir, which is often used to paralyze muscles during surgery, is the main cause of the violent and intense allergic reaction that may occur in the operating theater. On the other hand, one may experience a regular or long-term substance that will only cause allergies later in life. In this case, quantity plays the crucial role. The appearance of symptoms requires a certain dose of the allergen. In the stage of retirement, where daily life changes are very important, it is not unusual to show similar sensitivities. Also, the sensitivity of a substance may vary with age. If the sensitivities to induce excessive immune reactions and mechanisms are very well known, the reasons for the sensitivity of one person to the birth of allergies and the variability of allergic reactions, unknown and mysterious to this day. Here, experts point to genetic factors, a defect in the immune system linked to aging, or environmental factors such as pollution that may exacerbate immune responses.