What Hormones Do to a Trans Woman's Body

Rear view of an adult model showing **rounded buttocks and thighs** together with a penis. This is one possible appearance in a trans woman on feminizing hormones: body fat can shift toward the hips, thighs and buttocks and make the lower body look more feminine, while the **penis can remain as part of her body**. Feminizing hormones can change its size and function, but not all trans women want genital surgery.

Feminizing hormone therapy can gradually give a trans woman's body more feminine physical and sexual characteristics. Breasts can grow, fat and muscle distribution can change, skin can become softer, body hair can decrease, and the penis and testicles can function differently. The amount of change varies greatly between people.^[1]

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1 What does "female hormones" mean?
2 Breasts grow
3 The body becomes curvier
4 Muscles become smaller
5 The face can look more feminine
6 Skin becomes softer
7 Body hair decreases, but the beard may remain
8 The testicles become smaller
9 The penis may become smaller
10 Erections become less frequent
11 Ejaculation can decrease or disappear
12 Sex drive can change
13 Orgasms can feel different
14 Hormones do not simply change sexual orientation
15 Fertility decreases
16 What hormones do not change
17 Where do trans women get hormones?
18 Related adult search terms
19 More examples of trans body changes
20 References

What does "female hormones" mean?

Tablets used in **feminizing hormone therapy**: blue **estradiol** tablets provide estrogen, while white **spironolactone** tablets can be used to reduce the effects of testosterone. This combination is one example of hormone treatment used by some trans women.

For a trans woman, feminizing hormone treatment usually means taking estrogen while also reducing or blocking the effects of testosterone. These hormonal changes cause some of the same secondary sexual characteristics that develop during female puberty.^[1]

Estrogen can be taken in several forms. Common options include tablets, skin patches or gels, and injections; in some places, longer-lasting implants are also available.^[2]

The different forms mainly differ in convenience, how steadily the hormone enters the body and how much it passes through the liver. For example, patches and injections bypass the digestive system and first-pass metabolism in the liver, while swallowed tablets do not.

Some trans women also take a separate testosterone blocker, such as spironolactone or another antiandrogen. The exact medicines and method of taking them differ between countries and individuals.

Breasts grow

Hormones cause real breast tissue to develop, including nipples and the tissue beneath them. Growth usually begins within several months and can continue for several years.^[1]

A prospective study of 229 trans women found that breast growth during the first year was usually modest: 48.7% had less than an AAA cup after one year, and most breast development occurred during the first six months. Growth varied considerably between individuals.^[3]

A nude adult model with **more developed breasts**, showing how breast size can vary considerably between trans women. Feminizing hormone treatment can produce real breast growth, but the final size and shape differ from person to person. From the photograph alone, it is not possible to tell whether the breasts developed only from hormones or whether breast surgery has also been performed.

A nude adult model with **small, modestly developed breasts**, illustrating the range of breast growth that can occur during feminizing hormone treatment. Estrogen causes real breast tissue to develop, but the final size varies greatly between individuals and may remain relatively small. From a photograph alone, it is not possible to determine with certainty whether the breasts developed only from hormones or whether any breast surgery has been performed.

The body becomes curvier

Rear view of a nude adult model showing **full buttocks and thighs**, body areas where feminizing hormone treatment can increase the relative amount of subcutaneous fat. This redistribution can make the lower body look rounder and more typically feminine while muscle mass gradually decreases. A photograph alone cannot show how much of this body shape is caused by hormones rather than genetics, weight, exercise or other factors.

Body fat tends to increase and becomes distributed in a more feminine pattern. This can make the hips, thighs and buttocks look fuller and can reduce the typically masculine shape of the torso.^[4]

A meta-analysis found that trans women gained about 3 kg of body fat on average while losing about 2.4 kg of lean body mass during hormone treatment.^[4]

Muscles become smaller

Lower testosterone and estrogen treatment usually reduce muscle mass and strength. Shoulders, arms and other muscular areas can therefore gradually look less strongly masculine.^[5]

Hormones do not change the underlying adult skeleton in the same way, so shoulder width, height and other bone-based features usually remain.

Three nude adult models with relatively **slender bodies and little visible muscle definition** in the arms, shoulders and torso. Feminizing hormone treatment can reduce muscle mass and strength as testosterone activity falls, which may make the body look less muscular over time. The underlying adult skeleton, including shoulder width and height, changes much less. A photograph alone cannot show whether a person's build is caused by hormones, genetics, diet or exercise.

The face can look more feminine

Hormones can redistribute fat beneath the skin of the face, making the cheeks and other soft tissues look different even without facial surgery. A study using 3D facial scans found measurable facial feminization after hormone treatment.^[6]

Hormones cannot completely undo facial bone changes caused by an earlier testosterone-driven puberty.

A nude adult model with a **feminine-looking face**, including relatively soft facial contours and fuller cheeks. Feminizing hormone treatment can change the distribution of fat beneath the skin and make the face look softer over time, even without facial surgery. Hormones do not substantially reshape the adult facial bones, and from a photograph alone it is not possible to separate the effects of hormones from genetics, makeup or cosmetic procedures.

Skin becomes softer

The skin commonly becomes softer and less oily after several months of feminizing hormones.^[1]

Sweat and body odor can also change as testosterone activity decreases.^[7]

Body hair decreases, but the beard may remain

Body hair commonly becomes thinner and grows more slowly. Facial hair is usually affected much less, so a trans woman may still need to shave or use laser or electrolysis if she wants a hairless face.^[7]

Male-pattern scalp hair loss may also slow and can sometimes partly reverse.^[1]

The testicles become smaller

The testicles usually shrink during feminizing hormone treatment because testosterone production and testicular activity are suppressed.^[1]

A trans woman who has not had genital surgery still has a penis and testicles; hormones alone do not turn them into a vagina.

The penis may become smaller

The penis may become somewhat smaller during feminizing hormone treatment, especially as spontaneous erections become less frequent and erectile function decreases. The amount of change varies greatly, and there is no well-established average for how much penile size decreases in adult trans women.^[8]

A nude adult model with a relatively **small flaccid penis**. Feminizing hormone treatment can sometimes make the penis somewhat smaller, especially as spontaneous erections become less frequent and erectile function decreases. This photograph is only illustrative: without a before-and-after comparison, it is not possible to tell whether the penis became smaller during hormone treatment or was already this size beforehand.

Erections become less frequent

Spontaneous and morning erections commonly become less frequent, and erections during sexual activity may become weaker or more difficult to maintain.^[1]

This varies considerably. Some trans women can still become fully erect and use their penis for masturbation or penetrative sex, while others may have very little erectile function or lose the ability to achieve a usable erection altogether.

A nude adult model during partnered sexual activity while her **penis remains flaccid rather than becoming fully erect**. Feminizing hormone treatment commonly reduces spontaneous and sexually stimulated erections, and some trans women may have little or no usable erection during sex. This does not necessarily mean that she is not sexually aroused or enjoying the activity: erotic sensation and the ability to orgasm can remain even when the penis does not become firm.

Ejaculation can decrease or disappear

The amount of ejaculatory fluid usually decreases, and some trans women eventually produce little or no visible fluid when they orgasm.^[7]

An orgasm therefore does not necessarily produce the ejaculation that would commonly be expected before hormone treatment.

Sex drive can change

A prospective study of 401 trans women found that total, partnered and solitary sexual desire decreased during the first three months of hormone treatment. After 36 months, however, total and partnered desire were higher than before treatment, while solitary desire had returned to approximately its baseline level.^[9]

The effect on sex drive is therefore not simply a permanent decrease caused by lower testosterone.

Orgasms can feel different

Hormones may change not only erections but also the experience of orgasm. In a study of 130 trans women who had used hormones for at least one year, participants reported taking longer to reach orgasm and having longer orgasms; more than half reported orgasm sensations in new or additional areas of the body.^[10]

After hormone treatment, orgasms were also more often described as a longer, multiple-peak experience rather than a short single peak.^[10]

A nude adult model receiving **anal sex** while her penis remains flaccid. Her facial expression shows an intense physical reaction, illustrating that strong sexual pleasure does not require a firm erection. Feminizing hormones can reduce erectile response while orgasm and other sexual sensations may remain strong or change in character. A facial expression alone, however, cannot prove that orgasm is occurring.

Hormones do not simply change sexual orientation

A trans woman may be attracted to men, women, both or neither. Hormone treatment does not reliably make a trans woman become attracted to men.

A prospective study following 469 trans women found no systematic change in sexual orientation during hormone treatment and no relationship between partner preference and measured sex-hormone levels.^[11]

An adult scene showing a **trans woman with a female sexual partner**. Trans women may be attracted to women, men, both or neither. Longitudinal research did not find sexual orientation to change systematically during feminizing hormone treatment.^[11]

An adult scene showing a **trans woman with a male sexual partner**. Attraction to men is one possible sexual orientation among trans women, but feminizing hormones do not reliably create this preference. The ENIGI study found no systematic change in sexual orientation during hormone treatment.^[11]

An adult **T4T (trans-for-trans)** scene showing sexual activity between two trans women. T4T is a well-established dating and sexual preference in which a trans person prefers or is especially open to relationships with other trans people; it does not by itself define a particular sexual orientation. Trans partners may feel connected by a **shared understanding of transition, body changes, dysphoria and life as a trans person**, and some describe greater comfort because they have less need to explain these experiences to each other. T4T relationships are therefore a normal part of trans dating and sexual life, not a sign that either partner is less valid in her gender identity.

Fertility decreases

Feminizing hormones suppress sperm production and can eventually cause severe reductions in fertility. Recovery after stopping hormones is possible for some people but cannot be guaranteed.^[12]

A trans woman who may want genetically related children can freeze sperm before starting hormones. The stored sperm can later be used for insemination or IVF with a female partner or a gestational carrier.^[13]

Some trans women who did not preserve sperm beforehand may regain sperm production after temporarily stopping hormones, and fertility clinics can sometimes retrieve sperm even when none is found in the ejaculate. These options are less predictable, so sperm banking before hormone treatment is generally the most reliable way to preserve fertility.^[13]

What hormones do not change

Starting feminizing hormones after male puberty generally does not make the voice higher, substantially reduce the Adam's apple, shorten the body or completely reshape the adult skeleton. Voice changes usually require voice training or surgery, while many bone-based features simply remain unless they are surgically altered.^[14]

Hormones also do not create a vagina. A vulva and vagina can be created through gender-affirming surgery, which is separate from hormone treatment.

Where do trans women get hormones?

Feminizing hormones are usually prescribed by a doctor or another qualified healthcare provider. The provider can choose appropriate medicines and doses, check hormone levels and monitor blood tests during treatment.^[15]

Some trans people use DIY hormones bought online or obtained without a prescription, especially when access to transgender healthcare is difficult.^[16]

DIY use is not always completely unmonitored. Some people try to reduce risk by arranging their own blood tests, checking hormone levels or other laboratory values, and using harm-reduction information from experienced communities or healthcare services. However, self-monitoring is not equivalent to full medical supervision, because interpreting results, choosing medicines and recognizing complications can still require clinical expertise.^[17]

This is riskier without medical monitoring: estrogen can increase the risk of blood clots, spironolactone can cause dangerously high potassium or kidney problems, and some antiandrogens such as bicalutamide can cause liver injury.^[18]

The safest way to use feminizing hormones is therefore with medical supervision, so doses can be adjusted and complications can be detected before they become serious.

Related search terms include:

MTF HRT effects
trans woman HRT
feminizing hormones
MTF hormone changes
trans HRT body changes
MTF before and after

More examples of trans body changes

Two nude adult models showing visibly different **breast development, body shapes and genital appearance**. This image can illustrate how bodies may look very different during or after feminizing hormone treatment, because the amount of breast growth, fat redistribution, muscle loss and sexual changes varies greatly between individuals. A photograph alone cannot show which particular features are caused by hormones, genetics, surgery or other factors.

A nude adult model (during sexual activity) showing several body features that can be affected by **feminizing hormone treatment**. Her **developed breasts**, **rounded hips and buttocks**, **softer body contours** and feminine facial appearance illustrate the kinds of visible changes discussed on this page, while the penis remains present because hormones alone do not create a vagina. The image is illustrative: from a photograph alone, it is not possible to determine which individual features result from hormones, genetics, surgery or other factors.

Front view of a nude adult model showing several features that can appear together in a **feminized trans body**: developed breasts, a relatively narrow waist and a penis that remains part of her body. Feminizing hormones can contribute to breast growth, softer body contours and changes in fat and muscle distribution while also changing penile size and sexual function. The exact appearance varies greatly, and a photograph alone cannot show which features result from hormones, genetics, surgery or other factors.

Rear view of a nude adult model showing **rounded buttocks, fuller thighs and a penis**. This combination can occur in a trans woman on feminizing hormones: fat redistribution can make the lower body look more typically feminine, while the penis may remain part of her body. The exact degree of feminization varies greatly between individuals, and a single photograph cannot show how much of the body shape comes from hormones, genetics, weight or exercise.

Rear view of an adult model showing **rounded hips and buttocks** together with a penis and scrotum. This illustrates another possible combination of features in a feminized trans body: the lower body can develop softer, rounder contours while the original genitals remain. Feminizing hormones can contribute to fat redistribution around the hips, thighs and buttocks, but the exact body shape also depends strongly on genetics, weight and other individual factors.

References

↑ ^1,1 ^1,2 ^1,3 ^1,4 ^1,5 ^1,6 ^1,7 Mayo Clinic. Feminizing hormone therapy. 2024. Mayo Clinic
↑ UCSF Gender Affirming Health Program. Overview of feminizing hormone therapy. UCSF
↑ de Blok C. J. M. et al. Breast Development in Transwomen After 1 Year of Cross-Sex Hormone Therapy: Results of a Prospective Multicenter Study. Journal of Clinical Endocrinology & Metabolism, 2018. PubMed
↑ ^4,1 ^4,2 Klaver M. et al. Cross-sex hormone therapy in transgender persons affects total body weight, body fat and lean body mass: a meta-analysis. Andrologia, 2017. PubMed
↑ Harper J. et al. How does hormone transition in transgender women change body composition, muscle strength and haemoglobin? British Journal of Sports Medicine, 2021. PubMed
↑ Tebbens M. et al. Gender-Affirming Hormone Treatment Induces Facial Feminization in Transwomen and Masculinization in Transmen: Quantification by 3D Scanning and Patient-Reported Outcome Measures. Journal of Sexual Medicine, 2019. PubMed
↑ ^7,1 ^7,2 ^7,3 Deutsch M. B. Overview of feminizing hormone therapy. UCSF Gender Affirming Health Program. UCSF
↑ Planned Parenthood South Atlantic. Gender-Affirming Health Care. Planned Parenthood
↑ Defreyne J. et al. Sexual Desire Changes in Transgender Individuals Upon Initiation of Hormone Treatment: Results From the Longitudinal European Network for the Investigation of Gender Incongruence. Journal of Sexual Medicine, 2020. PubMed
↑ ^10,1 ^10,2 Zaliznyak M. et al. Effects of Gender-affirming Hormone Therapy on Orgasm Function of Transgender Men and Women: A Long Term Follow Up. Urology, 2023. PubMed
↑ ^11,1 ^11,2 ^11,3 Defreyne J. et al. Sexual orientation in transgender individuals: results from the longitudinal ENIGI study. International Journal of Impotence Research, 2021. PubMed
↑ Rodriguez-Wallberg K. A., Pfau D. R. Effects of feminizing gender-affirming hormone therapy on testicular function and reproductive capacity: review of data from clinical and experimental studies. Reproduction, 2025. PubMed
↑ ^13,1 ^13,2 UCSF Gender Affirming Health Program. Fertility options for transgender persons. UCSF
↑ Endocrine Society. Transgender Health Treatments. Endocrine Society
↑ Endocrine Society. Gender Dysphoria/Gender Incongruence Guideline Resources. Endocrine Society
↑ Kennedy C. E. et al. Self-administration of gender-affirming hormones: a systematic review of effectiveness, cost, and values and preferences of end-users and health workers. 2022. PMC
↑ Baker J. T., Buzzanell P. M. "Not just rebellious, it's revolutionary": Do-it-yourself hormone replacement therapy as Liberatory Harm Reduction. 2024. PubMed
↑ UCSF Gender Affirming Health Program. Overview of feminizing hormone therapy. UCSF