Secondary Sex Characteristics

A

Adam's Apple

The Adam's apple, also known as the laryngeal prominence, is a bump located in the neck that is caused by the presence of the thyroid cartilage. This cartilage forms part of the voice box (larynx) and can become more prominent during puberty due to hormonal changes, particularly in individuals with deeper voices.

B

Breast Development

Breast development, also known as thelarche, is the physical maturation process where breast tissue grows and develops, typically beginning during puberty in people assigned female at birth. This natural process involves hormonal changes that stimulate the growth of mammary glands, fat tissue, and supporting structures, ultimately creating fully developed breasts that can vary significantly in size, shape, and appearance among individuals.

D

Deepening-of-voice

Deepening-of-voice refers to the process where an individual's voice becomes lower in pitch, typically occurring during puberty in males. This change is primarily caused by the growth and enlargement of the larynx (voice box) and vocal cords due to increased testosterone levels. The deepening of voice is considered a secondary sex characteristic and is one of the notable signs of male pubertal development.

F

Facial Hair

Facial hair refers to the hair that grows on the face, particularly in the areas of the chin, cheeks, upper lip, and neck. It is a secondary sex characteristic primarily associated with male puberty and adulthood, though it can occur to varying degrees in people of all genders. The growth of facial hair is primarily stimulated by androgens, particularly testosterone.

N

Nipples

Nipples are the small, raised structures at the center of the areola on the chest, present in people of all sexes. They are dense with nerve endings, which makes them both functionally important — in lactating bodies they deliver milk — and one of the most responsive erogenous zones on the body. Nipples vary enormously in size, shape, and color from person to person, and most of that variation is completely normal. They are also a frequent source of worry: soreness, itching, burning, and changes around a period or pregnancy are among the most common reasons people search for information about them, and while most of these symptoms are benign, a few specific changes warrant a clinician's attention.

P

Pubic Hair

Pubic hair refers to the coarse, curly hair that grows in the pubic region of both males and females. It typically appears during puberty as a secondary sex characteristic and surrounds the genitals, extending to the inner thighs and lower abdomen. Pubic hair serves several biological functions, including reducing friction during sexual activity and helping to trap pheromones.

S

Sexual Dimorphism

Sexual dimorphism refers to the physical differences between males and females of the same species, beyond the differences in their sexual organs. In humans, this includes variations in size, shape, color, or structure that distinguish the two sexes. These differences are often the result of evolutionary processes and hormonal influences.

W

Widening of Hips

Widening of hips refers to the natural expansion of the pelvic region that typically occurs in females during puberty and continues into early adulthood. This process is primarily driven by hormonal changes, particularly the increase in estrogen levels, which stimulates the growth and reshaping of the pelvic bones and surrounding tissues.