Table 1.

Causes and characteristics of anaphylaxis^1,8

	Food	Medication/iatrogenic causes	Insect/venom sting
Age distribution: anaphylaxis (all severities)	Most common in preschool children, less common in older adults	Predominantly older ages	All ages
Typical presentation	Breathing problems	Circulation problems (breathing problems are less common)	Circulation problems (breathing problems are less common)
Onset	Less rapid	Rapid	Rapid
History of asthma/atopy	Common	Uncommon	Uncommon

Adapted from the 2021 Resuscitation Council UK guideline, Emergency treatment of anaphylaxis: Guidelines for healthcare providers.