[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.

In the feminist movement, the hippie culture, and in the punk rock scene, some women retain their underarm hair for a variety of reasons, from subversion to egalitarianism to comfort.

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

[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.