Plucking nose hairs stimulates nerve pathways that trigger tear production
Plucking nose hairs stimulates trigeminal nerve endings in the nasal mucosa, activating a reflex arc that recruits parasympathetic pathways to trigger tear production.
The claim is specific and empirical, passing Step 0. Multiple studies, including systematic reviews and experimental data on trigeminal stimulation and nasal mucosal reflexes, consistently show that sensory stimulation of the nasal mucosa triggers reflex lacrimation.
Thomas DC, Kodaganallur Pitchumani P, Barmak AB, Talluri S, Jiang W. Autonomic features of craniofacial neuralgias: a systematic review with meta-analysis.. 2024. https://doi.org/10.22514/jofph.2024.023
Demonstrates that trigeminal nerve stimulation, particularly via the nasal branch, frequently triggers lacrimation as an autonomic feature.
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Cochran SW, Millichamp NJ, Sebbag L. Beyond the Ocular Surface: Nasal Sensory Input as a Driver of Reflex Lacrimation in Dogs.. 2026. https://doi.org/10.1111/vop.70108
Confirms the presence of a functional nasolacrimal reflex where nasal mucosal sensory input drives tear production.
Catharina Egholm Poulsen, Karina Haugaard Bendixen, Astrid Juhl Terkelsen, Arne May, John Hansen, Peter Svensson. Region-Specific Effects of Trigeminal Capsaicin Stimulation.. 2019. https://doi.org/10.11607/ofph.2303
Shows that chemical stimulation of the nasal mucosa innervated by the trigeminal nerve results in a robust local parasympathetic activation and increased tearing.
Stephen C Pflugfelder, Austin Cao, Anat Galor, Kelly K Nichols, Noam A Cohen, Michelle Dalton. Nicotinic acetylcholine receptor stimulation: A new approach for stimulating tear secretion in dry eye disease.. 2022. https://doi.org/10.1016/j.jtos.2022.05.001
Explains that trigeminal afferents on the nasal mucosa initiate a reflex arc resulting in instantaneous tear secretion when stimulated.
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