Glossary

Hay Fever

Seasonal Allergic Rhinitis, often referred to as ‘hay fever’, is typically caused by outdoor allergens such as pollen from trees, grasses and weeds.

Perennial Allergic Rhinitis occurs year-round. It is usually triggered by allergens such as pets or dust mites.

Allergic Rhinitis is caused by allergens, which are usually harmless substances but trigger an allergic reaction in some people. People with rhinitis are prone to symptoms such as runny nose, sneezing, congestion and sinus pressure. Rhinitis can contribute to other problems such as asthma, sinus or ear conditions or trouble sleeping. Some people with rhinitis symptoms don’t suffer from allergies. The symptoms may be similar, but the causes are different.  

Strong odors, pollution, smoke, medications and other chronic health conditions may also contribute to Non-Allergic Rhinitis.

Histamine

Histamine is a chemical released by mast cells* in the immune system when the body encounters an allergen. This causes an allergic reaction.

Hives

Hives (also known as, urticaria), involve red, itchy, swollen areas of the skin that range in size and appear anywhere on the body. They can appear suddenly, and may be the result of an allergic reaction. Some people have chronic urticaria that occurs almost daily for months or, in some cases, years. Treatment with oral antihistamines* is frequently successful, but in severe cases, steroids may be needed. In addition to allergic reactions to medications, foods or other substances, hives may be triggered by viral infections, temperature extremes, water, sun and physical exercise.