Clinical characterization of patients with bipolar disorder and a history of asthma: An exploratory study

•One in five patients (19%) with BD reported a history of asthma.•Being female and having an evening chronotype were associated with asthma.•Comorbidities with an inflammatory component were associated with asthma.•Patients treated with lithium were less likely to report a history of asthma.•The circadian and immune systems may be implicated in the BD and asthma phenotype.