First, understand that a perfume allergy and perfume sensitivity are are completely different phenomena and have separate physiological processes. Yes, perfume allergies can be treated with limited exposure therapy and may respond to allergy medication. With perfume sensitivity, on the other hand, limited exposure therapy has been shown to increase symptoms rather than build tolerance. To be direct: fragrance sensitivity is caused by exposure. In essence, the (mostly synthetic) chemical components of fragrance travel through the air and enter the body through the nose and mouth. Not only do they stimulate the scent receptors but they are now inside the body where they enter the bloodstream and get carried to the brain. Over time, these chemicals damage the neural receptors in the brain.
Wonder why there are more reports of perfume sensitivity? Because manufacturers are putting perfume into more products, exposing people to more perfume, and more people are suffering irreparable brain damage. For those of us who suffer with this problem, we are advised to avoid perfume. It is impossible. It is everywhere. People like having a nice smell in all of their products and manufacturers are going to make what sells. Moreover, do we even know what other effects these chemicals have on the brain or the rest of the body. For instance, there are studies out there right now looking for links between perfume chemical exposure and a variety of other health problems that have inexplicably risen over the last few years. For all we know, the increase in Autism could be a result of those same chemicals entering the bloodstream of pregnant women, being carried to the fetus, and interrupting normal brain development. We just don't know.For those of you complaining about those of us who are sensitive to perfume, has it occurred to you to wonder what long-term effects you will suffer from covering yourself in man-made chemicals? You might as well coat yourself in pesticide everyday.