Nose hairs, known as vibrissae, are specialized, coarse hairs found in the nasal vestibule, the entrance to the nasal cavity. They are a fundamental component of the body’s respiratory defense system. Vibrissae represent the first line of defense against foreign material from the air we breathe, providing both physical filtration and air conditioning before air reaches the lungs.
The Essential Biological Role
The primary function of nasal vibrissae is to act as a physical barrier. These hairs trap larger airborne particles, such as dust, pollen, and mold spores, preventing them from traveling deeper into the respiratory tract. Filtration is assisted by a thin layer of mucus that coats the hairs, helping particles adhere to the surface where they can be later expelled.
Vibrissae also contribute to preparing inhaled air for the lungs. They warm and humidify the air as it passes through the nasal passages. This process prevents the mucous membranes of the respiratory system from drying out, which is necessary for proper lung function and maintaining overall respiratory health.
Why They Lengthen With Age
The lengthening of nose hair later in life is a common phenomenon rooted in the hair growth cycle. As people age, their nasal hair follicles can develop “anagen sensitivity,” which prolongs the active growth phase of the hair cycle.
The follicles become more responsive to hormones, particularly testosterone, which influences the size and growth rate of the hair. This prolonged growth period allows the hairs to grow noticeably longer and thicker than they were in younger years.
Consequences of Hair Removal
Removing nasal hair by plucking or waxing carries specific health risks because it compromises the body’s natural air filtration system. Removing this protective barrier increases susceptibility to inhaling airborne pathogens and debris, potentially increasing the risk of respiratory issues. The removal process can also cause ingrown hairs, inflammation, or an infection called Nasal Vestibulitis.
A more serious concern is the potential for infection to spread within the “danger triangle” of the face (from the corners of the mouth to the bridge of the nose). Veins in this region connect directly to the cavernous sinus, which leads toward the brain. Plucking creates an open wound, allowing bacteria like Staphylococcus to enter the bloodstream and, in rare cases, lead to life-threatening complications such as Cavernous Sinus Thrombosis. Professional advice is to trim only the hairs visible outside the nostril.