Seasonal allergy – or seasonal allergies – is a term used in most allergy cases to describe a group of symptoms that occur in certain seasons due to pollen, dust, hot weather…etc. Seasonal allergy is experienced by people who are allergic to different types of pollen such as tree pollen, grass/weed pollen, and flower pollen. It usually affects the respiratory system of the patient, but in some cases it affects the eyes and skin and it can trigger asthma symptoms as well.
For long time, the above term wasn't known; “hay fever” was used instead to indicate the same symptoms. But in fact, the hay fever wasn't the suitable term to indicate respiratory problems due to pollen, as the patients suffer from the pollen of already living plants and not the cut, dry hay grass.
Although most seasonal allergy symptoms are experienced during spring, they can happen at different times of the year, such as early summer, autumn and winter.
The severity of symptoms and when they happen depends actually on where you live as the climate plays the full role in pollination. Flowers, as they start to pollinate in spring, and trees will produce their highest pollen amounts when the weather gets warmer. By the end of spring and beginning of summer, the pollen allergy symptoms will occur. After that, starts the grass pollination, which will develop symptoms in some patients as the grasses will fully peak in June.
Until mid August the grasses will produce high pollen count that may last to the beginning of winter.
The same symptoms happening in winter could indicate flu, but when the difference is apparent, they indicate mold allergy as the ambiance gets wet in winter.
The length of pollination season depends on the country and the climate, so the basic factors aiding pollen allergy are limited within the region, the local climate and the wind speed.