Variation in Sex Characteristics: Meaning and Examples

The variation may involve:

• chromosomes;
• hormone production or response;
• ovaries or testes;
• internal reproductive organs;
• external genitals;
• puberty-related development;
• fertility;
• body hair, breasts, voice, or other secondary traits.

These variations are part of human biological diversity. Some require medical care, while others cause no health problem.

• variation, meaning a difference from a common pattern;
• sex characteristics, the physical and biological features associated with sex development.

The singular form refers to one difference or one general type:

• The examination identified a variation in sex characteristics.

The plural form refers to multiple traits, conditions, or experiences:

• People with variations in sex characteristics have diverse bodies and identities.

Common expressions include:

• be born with a variation in sex characteristics;
• identify a variation during puberty;
• live with variations in sex characteristics;
• provide care for people with sex-characteristic variations;
• discuss intersex variations;
• protect people with variations in sex characteristics.

The phrase is generally more neutral than expressions that describe the body as defective or abnormal.

They are often divided into two broad groups.

Primary Sex Characteristics

Primary sex characteristics are directly connected to reproductive anatomy and development.

They include:

• chromosomes;
• ovaries or testes;
• internal reproductive organs;
• external genitals;
• hormone-producing structures.

Secondary Sex Characteristics

Secondary sex characteristics usually develop or become more noticeable during puberty.

They may include:

• breast development;
• facial and body hair;
• voice changes;
• body-fat distribution;
• muscle development;
• menstruation;
• patterns of physical growth.

A variation may affect one characteristic or several.

Examples may involve:

• chromosome combinations other than the most common XX or XY patterns;
• differences in how the body produces or responds to androgens;
• reproductive organs that develop differently from typical expectations;
• genital appearance that is not clearly categorized as typically male or female;
• differences in puberty, menstruation, fertility, or hormone levels;
• gonadal tissue that does not fit typical ovarian or testicular patterns.

These variations are not all medically similar. Their causes, health effects, appearance, and treatment needs differ widely.

A person with a variation in sex characteristics may identify as intersex, but not everyone uses that word.

Someone may instead use:

• the name of a specific diagnosis;
• difference in sex development;
• variation in sex development;
• variation in sex characteristics;
• no special identity label.

The person’s preferred language should be respected.

However, many people prefer difference or variation because these words do not automatically present the body as defective.

Terminology may depend on:

• medical context;
• community preference;
• individual identity;
• cultural background;
• the presence or absence of health concerns.

A variation can be medically important without making the whole person disordered.

Before Birth

Prenatal testing or medical imaging may identify chromosome or anatomical differences.

At Birth

A variation may be noticed when external genital appearance differs from typical expectations.

During Childhood

Testing may occur because of growth, hormone, urinary, or reproductive concerns.

During Puberty

A person may seek care because:

• puberty does not begin as expected;
• menstruation does not start;
• breast or facial-hair development differs from expectations;
• the voice changes unexpectedly;
• genital development differs;
• hormone levels appear unusual.

During Adulthood

A variation may be found during:

• fertility testing;
• surgery;
• hormone testing;
• treatment for another condition;
• genetic testing.

Some people never discover that they have a variation.

Some variations cause no major health problem. Others may be associated with:

• hormone deficiencies or excesses;
• fertility differences;
• urinary difficulties;
• menstrual concerns;
• increased risk involving particular gonadal tissue;
• bone-health needs;
• pain;
• need for long-term monitoring.

Care should address actual health needs rather than assuming that every variation requires treatment.

• accurate diagnosis;
• hormone assessment;
• genetic counseling;
• reproductive or fertility counseling;
• psychological support;
• monitoring specific health risks;
• treatment of pain or functional problems;
• clear information about available options.

Healthcare should be individualized and explained in understandable language.

When treatment is not urgently required, the person should be allowed to participate meaningfully in decisions whenever possible.

These procedures may involve permanent changes to:

• genital appearance;
• sexual sensation;
• reproductive tissue;
• urinary function;
• future treatment choices.

When surgery is not medically urgent, many advocates emphasize delaying irreversible procedures until the person can participate in informed decision-making.

Urgent treatment may still be necessary when there is a serious health or functional concern. Medical necessity should be distinguished from social pressure to make a body appear typical.

A person with such a variation may identify as:

• a woman;
• a man;
• nonbinary;
• intersex as an identity;
• transgender;
• cisgender;
• another gender;
• no particular label.

Many intersex people identify with the gender assigned to them, while others do not.

Physical traits and gender identity are related aspects of human experience, but they are not the same thing.

A person may be:

• heterosexual;
• gay;
• lesbian;
• bisexual;
• asexual;
• pansexual;
• another orientation.

Sex characteristics describe the body. Sexual orientation describes patterns of attraction.

Possible experiences include:

• typical fertility;
• reduced fertility;
• infertility;
• need for assisted reproductive care;
• unexpected reproductive anatomy;
• uncertainty until testing is completed.

Healthcare professionals should avoid assuming reproductive goals. A person may want children, not want children, or remain undecided.

Respectful practices include:

• using the person’s preferred terminology;
• avoiding intrusive questions;
• not demanding medical proof;
• discussing anatomy only when relevant;
• protecting records and confidentiality;
• not treating the person as a curiosity.

Terms such as hermaphrodite are generally considered inaccurate and offensive when applied to humans.

A person with a variation in sex characteristics has physical sex traits that differ from typical expectations.

A transgender person has a gender identity that differs from the gender assigned at birth.

A person may be:

• intersex and cisgender;
• intersex and transgender;
• non-intersex and transgender;
• intersex and nonbinary.

One does not automatically imply the other.

A variation in sex characteristics concerns bodily development.

A masculine woman, feminine man, or gender-nonconforming child does not necessarily have an intersex variation.

Every intersex person has ambiguous genitals.
No. Variations may involve chromosomes, hormones, gonads, internal organs, or puberty without visible genital differences.

A variation automatically requires surgery.
No. Treatment depends on actual health and functional needs.

Intersex is the same as transgender.
No. Intersex concerns sex characteristics, while transgender concerns gender identity.

A variation determines sexual orientation.
No. Bodily characteristics do not determine attraction.

Every person prefers the same terminology.
No. People may prefer intersex, variation, difference, a diagnosis, or another term.

1. The doctor identified a variation in sex characteristics during puberty.
2. A variation in sex characteristics may involve chromosomes, hormones, gonads, or genitals.
3. Does every variation in sex characteristics require medical treatment?
4. Their variation in sex characteristics did not become apparent until adulthood.
5. A person with a variation in sex characteristics may or may not identify as intersex.
6. Respectful care distinguishes medical needs from pressure to make the body look typical.
7. Variations in sex characteristics do not determine gender identity or sexual orientation.
8. Understanding variation in sex characteristics helps readers discuss intersex bodies accurately and respectfully.

The concept is also connected to sexuality and reproductive health because some variations may affect puberty, fertility, sexual sensation, genital function, menstruation, or hormone-related development. These effects differ greatly between individuals.

Understanding variations in sex characteristics helps readers distinguish biological sex traits from gender identity and sexual orientation while respecting bodily diversity, privacy, informed decision-making, and individual terminology.