Body hair

Body Hair

Male body hair

Body hair refers to the hair that grows on the human body. It is a characteristic of all mammals, including humans, and varies in density, length, and texture across different parts of the body and among individuals. Body hair is categorized into two main types: vellus hair and terminal hair.

Types of Body Hair

Vellus Hair

Vellus hair is the fine, short, and lightly pigmented hair that covers most of the human body. It is often referred to as "peach fuzz" and is less visible than terminal hair. Vellus hair helps to regulate body temperature by providing some insulation and aiding in the evaporation of sweat.

Terminal Hair

Diagram of androgenic hair distribution

Terminal hair is the thicker, longer, and more pigmented hair that develops during and after puberty. It is influenced by androgens, which are hormones that increase during puberty. Terminal hair is found on the scalp, face, armpits, and pubic region, among other areas.

Development of Body Hair

Puberty

Changes during male puberty

During puberty, the increase in androgen levels leads to the transformation of vellus hair into terminal hair in certain areas of the body. This process is known as androgenic hair development. In males, this includes the growth of facial hair, chest hair, and pubic hair. In females, terminal hair growth is typically less extensive but includes pubic hair and underarm hair.

Adulthood

As individuals reach adulthood, the pattern and density of body hair can continue to change. Factors such as genetics, hormonal levels, and age can influence these changes. Some individuals may experience increased body hair growth, while others may notice thinning or loss of hair in certain areas.

Distribution of Body Hair

Armpits

Hairy armpits and chest

Armpit hair, also known as axillary hair, typically begins to grow during puberty. It serves a role in reducing friction between the skin of the underarm and the arm, and it may also play a role in the dispersal of pheromones.

Chest and Abdomen

Chest hair is more common in males and can vary greatly in density and pattern. Some men may have a full covering of hair, while others may have sparse or no chest hair. Abdominal hair often follows a pattern known as the "happy trail," which extends from the pubic area to the navel.

Arms and Legs

Arm hair

Adolescent leg hair

Hair on the arms and legs is common in both males and females, although it is generally more pronounced in males. The density and length of arm and leg hair can vary widely among individuals.

Facial Hair

Facial hair, including beards and mustaches, is a secondary sexual characteristic in males. It typically begins to grow during puberty and can continue to develop into adulthood. The style and grooming of facial hair can vary greatly across cultures and personal preferences.

Cultural and Social Aspects

Body hair has various cultural and social implications. In some cultures, body hair is considered a sign of maturity and masculinity, while in others, it may be seen as undesirable. Practices such as hair removal and grooming are influenced by cultural norms and personal preferences.

Related Pages

• Hair removal
• Puberty
• Androgen
• Vellus hair
• Terminal hair