Prodromal symptoms were reported by 399 of 485 participants (82.3%).¹ The most frequent prodrome was a non-itchy rash (78.7%), followed by a sense or hunch of an impending attack (52.6%), tiredness or fatigue (47.2%), and a tightness or prickling sensation (45.8%).¹
Although less common than rash, the sense or hunch carried the strongest link to a subsequent attack. It was the prodrome most likely to always be followed by an attack (47.4%).¹ Erythema marginatum-type eruptions were common across all participants, according to the investigators.¹
Triggers and Prodromes in Angioedema With Normal C1 Inhibitor
Key Takeaways
- Stress was the most common attack trigger in both the HAE-C1INH (91.5%) and ANM-nl-C1INH (81.25%) cohorts of the US HAEA Scientific Registry.
- Hormonal triggers in HAE-C1INH and menses in ANM-nl-C1INH were the triggers most likely to always be followed by an attack.
- A sense or hunch of an impending attack was the most reliable prodrome in HAE-C1INH (47.4%), versus tightness or prickling in ANM-nl-C1INH (62.2%).
In the ANM-nl-C1INH cohort, 83 of 96 participants documented ≥ 1 trigger.¹ Stress was again the most common trigger (81.25%), and menses was the trigger most likely to always be followed by an attack (38.5%).¹
Prodromal symptoms were reported by 83 of 96 participants.¹ Tightness or prickling was the most common prodrome (58.3%), followed by tiredness or fatigue (56.3%), non-itchy rash (51.0%), and a sense or hunch of an impending attack (45.8%).¹
In contrast with the HAE-C1INH cohort, the most reliable prodrome in this group was a tightness or prickling sensation, which had the greatest likelihood of always being followed by an attack (62.2%).¹ Across both cohorts, stress led all reported triggers, and hormonal factors showed the strongest association with subsequent attacks.¹
The findings extend prior work suggesting prodromes often occur early enough to allow on-demand treatment to begin before swelling develops.² The registry data point to a patient-reported sense of an impending attack in HAE-C1INH, and tightness or prickling in ANM-nl-C1INH as the prodromes most consistently tied to attack onset.¹
“We hypothesize that triggers and prodromes are fundamentally interconnected with attacks of HAE through activation of kinin generating pathways,” investigators concluded.
References
Christiansen SC, Wilmot J, Selva C, et al. The US HAEA Scientific Registry: triggers and prodromes. Ann Allergy Asthma Immunol. Published online September 21, 2026. doi:10.1016/j.anai.2026.09.740
Prematta MJ, Bewtra AK, Levy RJ, et al. Per-attack reporting of prodromal symptoms concurrent with C1-inhibitor treatment of hereditary angioedema attacks. Adv Ther. 2012;29(10):913-922. doi:10.1007/s12325-012-0053-5