Recurrent angioedema in childhood: hereditary angioedema or histaminergic angioedema?

Background Recurrent angioedema is a rare entity during childhood. This study aimed to clarify differences between hereditary angioedema (HAE) and histaminergic angioedema (HA) in children. Methods Fifty‐seven children with HAE (male 36.8%, 8.9 years [5.4‐12.5]) and 42 children with recurrent HA (male 42.9%, 11.5 years [8.1‐16.8]) were analyzed. Results The median age at symptom onset (6 [3‐10]; 7.8 [4.5‐13] years), frequency of angioedema episodes within last year (3 [2‐5]; 5 [2‐10]), and duration of symptoms (48 [24‐48]; 24 [12‐48] hours) were similar in the HAE and HA group, respectively. Recurrent urticaria was observed in 7.3% (n = 3) of patients in the HAE group and in 45.2% (n = 19) of the HA group (P