A high temperature (higher than 38☌) is usually caused by an infection instead. Sometimes the sinuses and throat can also be affected.ĭespite the name, hay fever does not cause a fever (high temperature). This causes inflammation in the nose (rhinitis) and eyes ( conjunctivitis). Cells on the lining of the nose and eyes release chemicals (for example, histamine) when they come into contact with pollen. The symptoms of hay fever are due to your immune system reacting to pollen. It can also cause allergic inflammation of the outer part of the eyes (allergic conjunctivitis).

This means inflammation of the nose (rhinitis), that occurs due to an allergy (allergic), occurring usually at the same time, or in the same season, each year (seasonal). In medical terms, hay fever causes a condition called seasonal allergic rhinitis. Weeds tend to pollinate from early spring to early autumn. Other people may be allergic to weed pollens (including nettles and docks). Tree pollens tend to affect people from March to May (early to late spring) each year. However, the term is often used when allergies are caused by other pollens such as tree pollens.

Grass pollen is the most common cause and tends to affect people every year in the grass pollen season from about May to July (late spring to early summer). Pollen is the name given to the fine powder that is produced by plants, trees or flowers to fertilise other plants, trees or flowers of the same species. Hay fever is an allergy to grass or hay pollens.

Do christmas tree cause hay fever