Hay fever causes: Difference between revisions

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Latest revision as of 21:58, 29 July 2020

Hay fever Microchapters

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Patient Information

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Hay fever from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Diagnosis

History and Symptoms

Physical Examination

Laboratory Findings

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Treatment

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Causes

The pollens that cause hay fever vary from person to person and from region to region; generally speaking, the tiny, hardly visible pollens of Anemophily (wind-pollinated) plants are the predominant culprits. Pollens of entomophily (insect-pollinated) plants are too large to remain airborne and pose no risk. Examples of plants commonly responsible for hay fever include:

  • Trees: Such as birch (Betula), alder (Alnus), hazel (Corylus), hornbeam (Carpinus), horse chestnut (Aesculus), willow (Salix), poplar (Populus), plane (Platanus), linden/lime (Tilia) and olive (Olea). In northern latitudes birch is considered to be the most important allergenic tree pollen, with an estimated 15–20% of hay fever sufferers sensitive to birch pollen grains. Olive pollen is most predominant in Mediterranean regions.
  • Grasses (Family Poaceae): Especially ryegrass (Lolium sp.) and Timothy-grass (Phleum pratense). An estimated 90% of hay fever sufferers are allergic to grass pollen.
  • Weeds: Ragweed (Ambrosia), plantain (Plantago), nettle/parietaria (Urticaceae), mugwort (Artemisia), Fat hen (Chenopodium) and sorrel/dock (Rumex)
  • Drugs: Prednisolone

References

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