Yes it does happen that you develop allergies to items that did not cause you any allergic reactions in the past. This could be an idiosyncratic reaction (no known cause, the immune system for no known reason attacks your own body tissues upon exposure to a particular allergen that previously it was neutral to) or after a viral infection, the immune system goes haywire (goes into overdrive), especially if the infection (which could have been without symptoms) is with certain viruses that are known to affect the immune system (like EBV or Parvovirus).
Sometimes you may develop certain allergies in the adulthood depending on several factors.
As people age, their immune systems weaken and their mucous membranes lose elasticity, making them more sensitive to irritants. "Even cold air becomes more problematic as we get older
The incidence of actual allergies is rising in adults and children around the world, for reasons that aren't totally understood. A popular theory is that modern hygiene has reduced the number of germs children are exposed to, so that their immune systems don't develop fully and attack harmless substances. Allergies may develop late in life, or seem to do so, in adults who had mild seasonal allergies that went unnoticed when they were children; the allergies may have become more severe as pollen counts have worsened.
A new environmental irritant, a previously mild allergy and the aging process can add up to new misery. Pregnancy, hormonal changes and many illnesses can alter a person's immune system so that a new onset of allergy predicted at adulthood.
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Annual Checkup
It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.
The American Dental Association recommends dental cleanings for adults at least twice annually. Some stains can only be removed by a professional cleaning.
It’s recommended by the American Academy of Ophthalmology that every adult between the ages of 18 and 80 does an eye examination at least once every two years.
It's recommended by the American Cancer Association that every adult between the age of 20 and 80 does an annual skin screening by a licensed dermatologist.
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