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Chest binding or 'binding' is a practice used by many trans and nonbinary people assigned a female sex at birth to achieve a flatter chest contour and affirm their gender. Binding allows individuals to affirm their gender in a temporary, reversible way. While many individuals who bind report negative physical symptoms, binding also often carries significant benefits for mental health and safety. In this commentary, we explain what the data do and do not say about the physical risks of binding and describe how decreasing stigma around binding will substantially reduce physical risks associated with binding and increase the benefits of the practice. As with any intervention, individuals should make an informed decision about the risks and benefits of binding. If negative physical symptoms arise, individuals can consider adjusting their binding practice or working with a healthcare provider to address these concerns.

BACKGROUND AND OBJECTIVES: Most transgender individuals assigned female at birth use chest binding (ie, wearing a tight garment to flatten chest tissue for the purpose of gender expression), often beginning in adolescence, to explore their gender identity. Although binding is often critical for mental health, negative physical side effects, ranging from chronic pain to rib fractures, are common. Time to first onset of symptoms is unknown. METHODS: A community-engaged, online, cross-sectional survey (“The Binding Health Project”) enrolled 1800 assigned female at birth or intersex individuals who had ever used chest binding. Lifetime prevalence of 27 pain, musculoskeletal, neurologic, gastrointestinal, generalized, respiratory, and skin or soft tissue symptoms related to binding was assessed. Nonparametric likelihood estimation methods were used to estimate survival curves. RESULTS: More than one-half (56%) of participants had begun binding by age 21, and 30% had begun by age 18. In 18 of 27 symptoms, the majority of people who go on to experience the event will do so within the first binding-year, but several skin-related and rare but serious outcomes (eg, rib fracture) took longer to occur. Pain presents rapidly but continues to rise in intensity over time, peaking at >5 years of binding. CONCLUSIONS: Although many symptoms emerge quickly, others can take years to develop. Individuals and their clinicians can use this information to make informed decisions on how to structure binding practices and top surgery timing while meeting goals related to gender expression and mental health. Access to puberty blockers may delay initiation of binding, preventing binding-related symptoms in youth.

Chest binding involves the compression of chest tissue for masculine gender expression among people assigned a female sex at birth, particularly transgender and gender non-conforming individuals. There are no peer-reviewed studies that directly assess the health impacts of chest binding, yet transgender community resources commonly discuss symptoms such as pain and scarring. A cross-sectional 32-item survey was administered online to an anonymous, non-random sample of adults who were assigned a female sex at birth and had had experience of binding (n = 1800). Multivariate regression models were used to identify practices associated with self-reported health outcomes. Of participants, 51.5% reported daily binding. Over 97% reported at least one of 28 negative outcomes attributed to binding. Frequency (days/week) was consistently associated with negative outcomes (22/28 outcomes). Compression methods associated with symptoms were commercial binders (20/28), elastic bandages (14/28) and duct tape or plastic wrap (13/28). Larger chest size was primarily associated with dermatological problems. Binding is a frequent activity for many transmasculine individuals, despite associated symptoms. Study findings offer evidence of how binding practices may enhance or reduce risk. Clinicians caring for transmasculine patients should assess binding practices and help patients manage risk.