Fig. 1.
Schematic representation of the sites of possible neuromodulatory intervention in chronic daily headaches. A Transcranial magnetic stimulation on the scalp, B direct current stimulation on the scalp, C transcutaneous stimulation of the supraorbital branch of the trigeminal nerve, D transcutaneous stimulation of the vagus nerve at the neck, E percutaneous stimulation of the great occipital nerve, and F deep brain stimulation of the posteroinferior hypothalamus or ventral tegmentum (Created with BioRender.com)