The manifestation of certain symptoms in a given period of the year, featuring the so-called seasonal allergies. This term is often used interchangeably with allergies to pollen, also called pollinosis, or, more commonly, hay fever. As regards allergens such as house dust mite are responsible for perennial allergies, meaning that occur throughout the year.
Although there pollens in atmospheric air throughout the year, which is in spring concentrations are higher. But whether this season as in summer, there are other agents that cause allergic reactions. Some are very serious and can be fatal, but the frequency is low. Sets an example allergy to insect venom.
“When there is a severe reaction to bee or wasp stings, is a medical emergency, and indication for these patients can have a kit for self-administration of epinephrine,” mentions Dr Angela Gaspar, Imunoalergologista, stressing: ” The most common insects to sting like mosquitoes and gnats, is a reaction limited to the skin, corresponding to vesicular lesions very pruritic (itchy) called scrofulous”.
It is also during the summer period in which the elevated temperatures and environment changes and habits often dependent on vacation, condition the appearance of physical urticaria, such as solar urticaria. These patients should wear high sunscreen protection and taking antihistamines.
Why in the spring?
Allergy to pollen is the most common form of seasonal allergy. But why typically occurs in the spring?
Dr Angela Gaspar replied that “in Portugal, as in other Mediterranean countries of Europe, the main cause of allergies to pollens are grasses (hay). These are very common and pollinate in full spring, reaching its peak usually during the months of May and June”.
Reactions to Parietaria herb (basil snake) are also common in our country The pollination period is usually wider, symptoms occurring throughout the spring and early summer.
With regard to pollens of trees, the olive tree is the main cause of allergy among the trees in Portugal, and its pollination period in spring.
“The concentrations of airborne pollens depend on the time of pollination, which is specific to each plant coincides in most plants with spring because it gives a temperature rise,” underlines the same imunoalergologista adding, “In year to year variations can exist in the main pollen season, with respect to time of year at which the peak of greatest intensity, and in relation to the concentrations…