Beard

A beard is facial hair growing on the jaw, chin, cheeks, neck, and lips.

While most common in pubescent and adult males, some women also develop them. Beards serve practical environmental purposes. They provide protection from the sun and help retain warmth in cold weather. Throughout history, human attitudes toward beards have shifted constantly. Cultural traditions and fashion trends dictate whether a beard is seen as a sign of beauty, wisdom, or strength. In some societies, beards represent high social status or virility. In other cultures, they are linked to eccentricity or poor hygiene.

Biologically, beard growth is driven by hormonal changes during puberty.

The process involves the stimulation of hair follicles by dihydrotestosterone. This hormone is produced from testosterone, which can vary in level depending on the season. Dihydrotestosterone also plays a role in promoting balding. Because growth rates are influenced by genetics, not all men grow the same amount of hair. Biologists classify beards as a secondary sexual characteristic. This means they are mostly unique to one sex but do not play a direct role in reproduction.

Evolutionary biologists have studied why beards developed in humans. Charles Darwin first suggested the theory of sexual selection in his work, *The Descent of Man*. This theory suggests that certain traits become common because they help individuals attract mates. Modern biologists have reaffirmed this role through research. They found evidence that a majority of women find bearded men more attractive than clean-shaven men. Some scholars debate whether this is driven by attractiveness, known as inter-sexual selection, or by dominance, known as intra-sexual selection. A beard may signal sexual maturity or increase the perceived size of the jaw to show dominance.

Beards also act as indicators of a male's overall physical condition.

Evolutionary psychology suggests that facial hairiness can influence perceived attractiveness. Some theories propose that excess testosterone, evidenced by a beard, might indicate mild immunosuppression. This could potentially support spermatogenesis, or the production of sperm. However, beards carry evolutionary costs as well. In hand-to-hand combat, a beard can make a male vulnerable by providing an easy way for an opponent to grab and hold his head. Biologists believe the evolutionary benefits of beards must outweigh these physical risks.

Ancient civilizations displayed diverse approaches to facial hair.

The Phoenicians arranged their beards in three to five rows of small, tight curls. Mesopotamian civilizations, including the Assyrians and Babylonians, used tongs and curling irons to create elaborate ringlets. In Egypt, many men were clean-shaven, but high-ranking individuals sometimes dyed their chin hair reddish-orange with henna. They might even weave gold thread into the hair. Egyptian kings and queens regnant also wore a metal false beard, called a postiche, to signify sovereignty.

In Ancient Greece, the beard was a symbol of virility.

Shaving was often a sign of mourning, and a smooth face was sometimes viewed as a sign of effeminacy. This changed during the reign of Alexander the Great in Macedonia. He promoted clean-shaven faces because he believed they looked tidier. He also feared that beards would serve as handles for enemies to grab during battle. This Macedonian custom spread throughout his empire. Eventually, the beard became a professional badge for philosophers, a tradition that lasted long after the Macedonian period.

Roman history shows a dramatic shift in grooming habits. Early Romans did not practice widespread shaving. The first barber was brought to Rome around 454 BCE. Eventually, being clean-shaven became a way to distinguish Romans from the Greeks. Shaving was even celebrated as a festival marking the beginning of manhood. However, the Emperor Hadrian changed Roman fashion by growing a full beard. This was partly to hide scars on his face. Following Hadrian, many Roman men imitated this Greek-inspired style. This helped cement the association between beards and the intellectual status of philosophers.