HCRT and Headache: Diaphragmatic breathing can improve brain function via the following mechanisms: (a) chemical, which involves the regulation of biomolecules such as adenosine, melatonin, orexin, or calcitonin‐gene‐related peptide; (b) mechanical, which involves enhancing the rate, length, or intensity of breathing at the cortical level; and (c) cortical‐subcortical control, which is related to shared breathing centers and headache‐related networks such as the brainstem and medullary centers (Peña et al., 2020; Reiter et al., 2005; Sclocco et al., 2019; Vila‐Pueyo et al., 2018).