Training: Hay fever
Chapter 1: Clinical Overview

Part 3: Causes

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Hay fever is an allergic reaction to allergens/triggers in the environment, most commonly:

  • Pollens – from grasses, weeds and some trees.

  • Dust mites – found in the home, these are tiny creatures which can’t be seen without a microscope, that feed on discarded human skin flakes and dust.

  • Animal dander – discarded skin flakes from pets such as dogs, cats, rabbits etc and feather dust from birds.

  • Moulds and fungal spores – these flourish in damp, dark and warm areas where ventilation is poor, like a bathroom, laundry or kitchen.

  • Air pollutants – which may be from cleaning products, scented air fresheners and the like.