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This occurs because of similarities in the proteins of the pollen and the food. [24] There are many cross-reacting substances. Hay fever is not a true fever, meaning it does not cause a core body temperature in the fever over 37.5–38.3 °C (99.5–100.9 °F). [citation needed]
List of medical symptoms. Medical symptoms refer to the manifestations or indications of a disease or condition, perceived and complained about by the patient. [1] [2] Patients observe these symptoms and seek medical advice from healthcare professionals.
Also, tree pollen season tends to end around May. Allergies are the result of immune system reactions to allergens. When a person encounters something they are allergic to, different chemicals ...
In the developed world, about 20% of people are affected by allergic rhinitis, [15] food allergy affects 10% of adults and 8% of children, [16] and about 20% have or have had atopic dermatitis at some point in time. [17] Depending on the country, about 1–18% of people have asthma. [18] [19] Anaphylaxis occurs in between 0.05–2% of people. [20]
The immune system sees the pollen as a danger and releases antibodies that attack the allergens. That leads to the release of histamines into the blood. Histamines trigger runny noses, itchy eyes ...
This differs from class 1 food allergy where sensitisation to the protein occurs in the GI tract, and is produced as a result of exposure to the food itself. [5] OAS can occur any time of the year, but is most prevalent during the pollen season. Individuals with OAS usually develop symptoms within minutes of eating the food. [6]
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Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds. [1] Pollinating agents can be animals such as insects, for example beetles or butterflies; birds, and bats; water; wind; and even plants themselves.