What causes lgbtq

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Last updated: April 4, 2026

Quick Answer: The causes of LGBTQ+ identities are complex and not fully understood, but scientific consensus points to a combination of genetic, hormonal, and environmental factors influencing development before birth. It is not a choice, nor is it caused by upbringing or life experiences.

Key Facts

What Causes LGBTQ+ Identities?

The question of what causes someone to be LGBTQ+ (Lesbian, Gay, Bisexual, Transgender, Queer, and others) has been a subject of significant scientific inquiry and public discussion. The overwhelming scientific consensus, supported by major medical and psychological organizations, is that sexual orientation and gender identity are not choices, nor are they caused by upbringing, trauma, or social influences. Instead, they are understood to be the result of a complex interplay of biological factors that influence an individual's development, primarily before birth.

Understanding Sexual Orientation

Sexual orientation refers to an individual's pattern of emotional, romantic, and/or sexual attraction to men, women, both, or neither. While a precise cause remains elusive, research points to several key biological influences:

Genetics

Studies, including those involving twins and families, suggest that genetic factors play a role in sexual orientation. However, it's not a simple matter of a single gene determining orientation. Instead, it's likely that multiple genes, interacting with each other and with environmental factors, contribute to the predisposition towards a particular sexual orientation. The exact genetic mechanisms are still being researched.

Prenatal Hormones

Another significant area of research focuses on the role of hormones during prenatal development. Exposure to certain levels of hormones in the womb, particularly androgens, is thought to influence the development of brain structures that are later associated with sexual orientation. For example, differences in the size and structure of certain brain regions have been observed in gay and heterosexual individuals. This suggests that the hormonal environment in utero can have lasting effects on sexual orientation.

Fraternal Birth Order Effect

One of the more robust findings in the study of male sexual orientation is the fraternal birth order effect. This phenomenon, observed by Dr. Ray Blanchard and others, suggests that the more older brothers a man has, the more likely he is to be gay. The proposed explanation is immunological: with each male pregnancy, the mother's immune system may develop an increasing response against male-specific proteins, which could then affect brain development in subsequent male fetuses, potentially influencing sexual orientation.

Understanding Gender Identity

Gender identity is a person's internal sense of being male, female, both, neither, or somewhere else along the gender spectrum. This is distinct from sexual orientation. Like sexual orientation, gender identity is believed to be shaped by a combination of biological factors, developing very early in life, often before a child is even born.

Brain Development

Research suggests that gender identity may be related to the development of the brain. Studies using neuroimaging techniques have explored differences in brain structure and function between cisgender (individuals whose gender identity aligns with the sex assigned at birth) and transgender individuals. While findings are still emerging and require more research, some studies suggest that certain aspects of brain structure in transgender individuals may align more closely with their experienced gender identity than with the sex they were assigned at birth.

Hormonal Influences

Similar to sexual orientation, prenatal hormonal environments are also hypothesized to play a role in gender identity development. The complex interplay of hormones during critical periods of fetal development could influence the organization of the brain in ways that contribute to one's sense of gender.

Dispelling Myths and Misconceptions

It is crucial to understand that LGBTQ+ identities are not a result of:

The Scientific Consensus

Leading health organizations, including the American Psychological Association (APA), the American Medical Association (AMA), and the World Health Organization (WHO), affirm that sexual orientation and gender identity are complex traits influenced by biological factors. They emphasize that efforts to change sexual orientation or gender identity (conversion therapy) are ineffective and harmful.

In summary, while the precise mechanisms are still under investigation, the scientific understanding of LGBTQ+ identities points towards innate biological factors influencing development. These identities are a natural part of human diversity, not a result of external influences or personal choices.

Sources

  1. Causes of homosexuality - WikipediaCC-BY-SA-4.0
  2. Understanding sexual orientation and gender identity - American Psychological Associationfair-use
  3. Sexual orientation: How is it determined? - Mayo Clinicfair-use

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