[1] These odorant substances have been suggested by some to serve as pheromones, which play a role related to mate selection, although this is a controversial topic within the scientific community.

[9] The contents of the axilla include the axillary vein and artery, as well as the brachial plexus, lymph nodes and fat.

[12] Conversely but uncommonly, some men choose to remove their underarm hair for aesthetic reasons or to reduce friction in sports such as swimming.

Breast cancer typically spreads via lymphatic vessels to the lymph nodes found in the axilla.

[14] Intertrigo is worsened by infection, usually fungal (Candida yeast species), but also bacterial or viral; warm, wet underarms promote those growths.

[14] Axillary intertrigo is common among those who work in hot environments where air circulation is restricted by necessary clothing or safety equipment.