Infections |
Viral |
Parasitic |
Bacterial |
IgE-mediated allergic cases |
Medications |
Insects |
Stinging (yellow jackets, bees, wasps, hornets, fire ants) |
Biting (Triatoma [kissing bugs]) |
Foods |
Blood products (urticarial transfusion reaction) |
Latex (contact or inhaled) |
Contact allergens (animal saliva, raw foods) |
Aeroallergens (rare) |
Food additives |
Direct mast cell activation |
Narcotics/opiates |
Muscle relaxants (eg, succinylcholine) |
Radiocontrast agents |
Vancomycin |
Physical stimuli |
Dermatographism |
Delayed pressure |
Cold |
Cholinergic |
Vibratory |
Aquagenic |
Solar |
Exertion/exercise |
Miscellaneous mechanisms |
Nonsteroidal anti-inflammatory drugs |
Serum sickness |
Transfusion reactions (distinct from IgE-mediated reactions) |
Hormone-associated (progesterone) |
Stinging nettle |
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