Hormones affect voice pitch differently depending on the type used. Testosterone deepens the voice by thickening the vocal cords, while oestrogen does not raise pitch. As a result, trans men often experience natural deepening, while trans women rely on voice training or surgery for feminisation.
How Does Testosterone Deepen the Voice?
Testosterone increases the size and mass of the vocal folds, causing them to vibrate more slowly. This results in a lower, richer tone similar to what happens during puberty in cisgender men. The change typically begins after a few months of hormone therapy.
Most people notice gradual changes between three and six months, with stabilisation after a year. Some still choose speech therapy to improve clarity, resonance, and control once the pitch has lowered.
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Why Doesn’t Oestrogen Raise the Voice in Trans Women?
Oestrogen does not thin or shorten the vocal cords, meaning it cannot reverse the deepening effect of testosterone from puberty. Therefore, trans women often experience no natural pitch change with hormones alone. Voice therapy helps retrain resonance, intonation, and phrasing to sound brighter and lighter.
In some cases, surgical options like glottoplasty can further raise pitch, but these are typically paired with post-surgery therapy for best results.
How Long Do Hormone-Related Voice Changes Take?
Testosterone changes happen gradually over months, whereas oestrogen’s effects on the voice are minimal. Therapy, however, can create noticeable improvements within weeks when practised regularly.
Research shows that over 80% of clients in structured voice therapy programmes achieved measurable pitch change within six months, regardless of hormone use.
Can Hormones Alone Create a Natural Voice?
Not always. Hormones alter pitch but not the finer qualities that make speech sound natural — like resonance, tone, and rhythm. Combining hormone therapy with professional voice training helps achieve a balanced, expressive voice that feels authentic.
Why Is Professional Guidance So Important?
A voice specialist can monitor your progress safely and guide you through vocal adjustments during transition. They help you balance pitch with healthy technique, preventing tension or fatigue as your body changes.
For expert, confidential voice care during transition, you can book a comprehensive assessment with Mr Hamilton at The London Clinic or One Welbeck by calling 020 7034 6053 to discuss any concerns about your voice.
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