I have read that there are carcinogens in fragrances. The issue regarding the health effects of perfumes and other scented products in workplaces, hospitals, schools and other places is controversial. There are conflicting reports of the effects that they may or may not cause in certain individuals.
More research is needed and some is being undertaken.
The severity of these symptoms can vary. It is important to remember some products which claim to be 'scent free' may have only masked the scent by use of an additional chemical. Be sure to research the product carefully if using scented products around those who are sensitive. I have read that there are carcinogens in fragrances. While it depends on the formula, there can be chemicals in fragrances and related products that have been determined to cause cancer in occupational settings or in laboratory animals.