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Hay fever worse in spring than summer
Monday January 02, 2012 08:15:41 AM,
IANS
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London: New research shows that regardless of
medication and other allergies for grass pollen, hay fever
symptoms are worse in the first half of spring than in summer.
Symptoms of hay fever such as a running nose, sneezing and itchy
eyes are caused by an allergy to grass pollen, bringing misery to
sufferers through spring and summer.
Worldwide, there are over 10,000 species of grass and most of
these species are able to cause symptoms in people who have hay
fever.
The different species release their pollen sequentially, so that
for the sufferer, hay fever (also called 'seasonal allergic
rhinitis') can last for the whole three months when grasses are
flowering.
Researchers from Leiden University Medical Centre (LUMC) in the
Netherlands compared daily pollen counts with daily symptoms
reported by hay fever sufferers (with a positive skin test to
grass pollen).
LUMC's Letty de Weger, who led the research, explained: "It is
possible that sufferers report their symptoms as milder later in
the season because they get used to their hay fever, or that the
pollen from late flowering species is less allergenic than pollen
from early flowering grass."
The people in the study were also tested for other common
allergies including birch pollen, house dust mites, dogs and cats.
The study covered the consecutive hay fever seasons of 2007 and
2008.
Symptoms of hay fever definitely matched the concentration of
pollen in the air and also the amount of medication taken.
Higher medication use was seen during days with high pollen counts
and severe symptoms, while less medication was taken on days with
low pollen counts and milder symptom severity.
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