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Noradrenergic system involvement as a major driver of tension-type headache: a systematic review of the current evidence.

J Headache Pain · 2026 · PMC12903287 · PMID 41559550

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observed a trend towards lower plasma levels of neuropeptide Y (NPY) – a peptide co-stored and co-released with NE, serving as an indirect biomarker [ 70 ] - compared with healthy controls, although this difference did not reach statistical significance [ 32 ].

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