A seasonal allergy is an allergic reaction to a trigger that is typically only present for part of the year, such as spring or fall. This type of allergy refers to a pollen allergy, such as trees, weeds and grasses. Perennial allergies, on the other hand, are usually present year-round, and include allergens such as pet dander and house dust mites.
Spring allergies are a result of pollen from trees, which can start pollinating anytime from January to April, depending on the climate and location. Trees that are known to cause severe allergies include oak, olive, elm, birch, ash, hickory, poplar, sycamore, maple, cypress and walnut.
Grass pollen is typically the main cause of late spring and early summer allergies. Grass pollen is highest at these times, although grass may cause allergies through much of the year if someone is mowing the lawn or lying in the grass. Contact with grass can result in itching and hives in people who are allergic to grass pollen.
Weed pollen is the main cause of seasonal allergy in the late summer and early fall. These weeds include ragweed, sagebrush, pigweed, tumbleweed (Russian thistle) and cocklebur.
Once your allergy type is diagnosed, we use immunotherapy to reduce or eliminate the allergic responses. Unlike antihistamines, immunotherapy trains the immune system to tolerate the allergen by gradually introducing increasing amounts of the allergen which reduces overall sensitivity your immune system has to it.