Thunderstorm-asthma, two cases observed in Northern Italy

Thunderstorm asthma is a rare event: in this letter we describe two cases observed during the same month of 2018 at an Italian Emergency department, assessed by the same medical team and according to the same methodology and approach. Given the infrequency of such a phenomenon and the debate around its nature, frequency, and - at times - existence, we strongly believe it is important for all specialists who observe such cases to report them, building an evidence base to expand its knowledge and understanding.