Casuarina pollen allergy: Symptoms, Treatment, Immunotherapy, Tips to avoid

Casuarina pollen originates from the Casuarina tree which is native to Australia, Southeast Asia, and the islands of the Pacific Ocean. It is a highly resilient species and thrives in a broad range of environments. Despite being native to the coastal regions, it has successfully colonized many kinds of landscapes, including urban areas as long as there is direct sunlight. Casuarina trees are typically found in coastal areas where they can tolerate salty, sandy soils and high winds. They're often used in the stabilization of sand dunes due to their invasive root system, making them typical along many coastlines. They have also been introduced to other regions as ornamental trees due to their slender, elegant appearance. In addition, they are used for timber and firewood in many parts of the world due to their hard, dense wood. The Casuarina genus is not just confined to the Pacific; it is also found in the Americas, parts of Africa, and southern Europe. In the United States, it is particularly concentrated in Florida, where it is often seen lining streets and highways. Across all these regions, the trees produce vast amounts of pollen in spring and autumn, which can trigger allergic reactions in many people. The widespread cultivation and naturalization of these trees mean that Casuarina pollen is a common allergen across a vast geographical area.