is defined as the presence of momentary wheals, which mostly resolve
within a few hours after appearing. Cholinergic hives is a skin
rash brought on by a hypersensitive reaction to body heat. It is
actually a subcategory of physical urticaria.
Hives rash caused by both acute and cholinergic hives are very
itchy and painful.
hives symptoms follow any stimulus to sweat, such as
running or exercise, heat from the direct sunlight, and high
saunas, as well as spicy foods, which may cause an increase in body
very hot showers, or sometimes extreme stress due to blushing or anger.
In some cases, individuals only have symptoms during the winter season
where their body temperature rises when it is un-acclimatized to heat.
hives usually occur in response to certain allergies and it is
believed that 15-20% of the population suffers from acute urticaria at
some point in their lives. A few minutes after the person has been
exposed to the allergen, acute urticaria becomes apparent. It may last
several weeks in some cases, but mostly it vanishes within a few hours.
Normally, the hives is a reaction to food, but in 50% of the cases,
trigger is unknown and is called idiopathic hives. Besides foods, bee
or wasp stings, or skin contact with certain fragrances can also be the
mostly affect infants and children. Causes of acute hives in
children include Idiopathic (unknown) causes, allergen infections,
foods, and drugs. Nearly half of the children with acute urticaria have
evidence of functional auto-antibodies.
If a child is suffering from acute hives, the causes should be avoided
as much as possible. H1 antihistamines, i.e. classical and second
generation can be used. In some cases, H2 antihistamines can also be
given. Oral corticosteroids have also been found useful. Epinephrine
should be given for anaphylaxis only; however, if the urticaria is
hereditary, epinephrine may not be as useful.
Dr. Gary M. Levin, M.D. & Surgeon)
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