Allergies and hypersensitivities
An allergic reaction occurs when the immune system overreacts to a foreign substance that usually causes few or no problems in most people.
Perfume stinks: how fragrances can affect your health
Fragrances and fragranced products cause health problems, such as asthma and headaches, in 1 in 3 people. Find out what you can do if you experience symptoms.
What causes asthma?
Trusted information on the causes of asthma and factors that increase the likelihood of developing asthma, and links to trusted resources
Thunderstorm asthma is triggered by a combination of thunderstorm conditions and a high pollen count, but even people who’ve never had asthma can experience it.
Trusted information about allergy types, as well as allergy testing, anaphylaxis, antihistamines and common related conditions such as asthma and hay fever.
Antihistamine medications help ease allergy symptoms. Read more here about how they are used to treat conditions like hay fever and asthma.