Pollen is the biggest trigger of spring allergy. These are nothing but the tiny grains released by weeds, grass and trees in air. The allergies caused due to the pollens released during the spring seasons are called spring allergies. The immune system of human beings is overdriven when these pollen grains are inhaled. The reason why immune system are overdriven is that they think that some foreign substances have invaded and hence they start releasing antibodies. Hence, the same mechanism is followed by the immune system, which it carries out for foreign substances such as viruses, bacteria etc. Since antibodies attack pollens, the histamine is released into the blood stream. The release of histamine chemicals is what gives rise to allergic problems such as itchy eyes, runny nose etc.

Since it is a spring season, the pollens can easily travel for miles together and thereby, giving rise to allergies in several areas. However, the severity of allergy will directly depend on the inhaled pollen count. In fact, the pollens are the allergens here. The severity of allergy increases with increase in count of pollens. Fortunately, it can be easily cured as a wide range of medications is exclusively available for spring allergies.