Gender-affirming bottom surgery carries real risks, but “dangerous” depends on what you’re comparing it to and which procedure you mean. Feminizing vaginoplasty and masculinizing phalloplasty sit at very different points on the complication spectrum. Vaginoplasty complication rates are broadly comparable to other major pelvic surgeries, while phalloplasty, which involves building a structure from scratch using tissue transplanted from another body site, has some of the highest complication rates in reconstructive surgery. Mortality from either procedure is rare. What follows is a detailed look at what can go wrong, how often it does, and what the evidence actually says about long-term outcomes.
Overall Complication Rates Vary Dramatically by Procedure
The single most important thing to understand is that “bottom surgery” is not one operation. It’s a family of procedures, and the risk profile of each one is distinct. A systematic review and meta-analysis of phalloplasty outcomes found an overall complication rate of about 77%, driven largely by urethral problems: fistula in roughly a third of patients and stricture in about a quarter.1PubMed. Outcomes Following Gender Affirming Phalloplasty: A Systematic Review and Meta-Analysis That number sounds alarming, and it is high, but most of those complications are correctable with additional procedures rather than life-threatening.
For vaginoplasty, the picture is considerably milder. A meta-analysis found pooled complication rates of about 14% for stenosis and strictures, around 2% for fistula, roughly 1% for tissue necrosis, and about 4% for prolapse.2PubMed. Complications and Patient-Reported Outcomes in Male-to-Female Vaginoplasty – Where We Are Today: A Systematic Review and Meta-Analysis An analysis of the national surgical quality database covering 2010 to 2020 identified over 1,800 gender-affirming bottom surgeries and found that higher body mass index raised the risk of wound complications in transmasculine patients, while diabetes increased wound complication risk in transfeminine patients.3PubMed. Thirty-Day Complication Rates After Gender-Affirming Bottom Surgery: An Analysis of the NSQIP Database From 2010 to 2020
What Can Go Wrong After Vaginoplasty
Vaginoplasty involves creating a vaginal canal, reshaping the external genitalia, and repositioning nerve tissue to form a neoclitoris. The most common early complications are wound-related. One study of over 500 vaginoplasty cases using a national database found that wound dehiscence, superficial surgical site infection, or deep infection occurred in about 9% of cases. Among patients who needed reoperation, roughly two-thirds were due to wound problems, vaginal bleeding, or hematoma.4PubMed. Postoperative adverse events following gender-affirming vaginoplasty: an American College of Surgeons National Surgical Quality Improvement Program study
Stenosis, the gradual narrowing or shortening of the neovaginal canal, is the complication that dominates long-term management. It can affect up to about a third of patients and is closely tied to dilation adherence after surgery.5The Journal of Sexual Medicine. Breaking down the barriers: identifying barriers to dilation after gender-affirming vaginoplasty Patients who had difficulty maintaining their dilation protocol were nearly eight times more likely to develop vaginal stenosis.6PubMed Central. Vaginal Stenosis of the Neovagina in Transfeminine Patients after Gender-affirming Vaginoplasty Surgery This means a meaningful share of the vaginoplasty risk burden isn’t really about the surgery itself but about what happens in the months and years afterward.
Rectovaginal fistula, an abnormal connection between the neovagina and the rectum, is the most feared complication. It remains a complex problem to manage when it occurs.7PubMed Central. Rectovaginal Fistula Repair Following Vaginoplasty in Transgender Females: A Systematic Review of Surgical Techniques The pooled fistula rate sits around 2%, meaning the vast majority of patients do not experience it. When rectal injury does occur during surgery, the fistula risk can be reduced if it’s detected and repaired at the time of the operation.8PubMed. Rectal Injury During Penile Inversion Vaginoplasty
Why Phalloplasty Carries Higher Risks
Phalloplasty is one of the most complex procedures in reconstructive surgery. It typically requires harvesting a large flap of tissue, often from the forearm, and shaping it into a phallus with a functional urethra running through it. That urethral construction is where most complications originate. The pooled rate of urethral fistula or stenosis across phalloplasty patients sits near 49%, and the prosthesis complication rate is close to 28%.9PubMed. A systematic review and meta-analysis of urethral complications and outcomes in transgender men Urethral strictures are the most frequently reported issue and can require additional surgeries to correct. Staged repair approaches have consistently shown lower recurrence rates than single-stage repairs, especially for longer or more complex strictures.10International Journal of Impotence Research. Systematic review of the outcomes of urethroplasty following urethral lengthening in transgender men
The donor site where tissue is harvested introduces its own complications. For the commonly used radial forearm free flap, the overall donor site complication rate was about 8%. Skin graft failure at the forearm was the most common issue. Other problems included decreased strength or sensation in the arm, limb swelling, and, rarely, compartment syndrome.11PubMed Central. Donor Site Morbidity in Phalloplasty Reconstructions: Outcomes of the Radial Forearm Free Flap The visible scar on the forearm is another consideration that patients weigh when choosing a donor site.
Despite the high complication numbers, it’s worth noting that patient satisfaction with phalloplasty remains high. Across studies, about 91% of patients were able to void while standing, roughly 88% reported tactile or erogenous sensation, and the patient-reported satisfactory outcome rate was over 90%.9PubMed. A systematic review and meta-analysis of urethral complications and outcomes in transgender men Complications are frequent, but most patients ultimately get to the functional goals they were seeking.
Metoidioplasty as a Lower-Risk Alternative
Transmasculine patients who want a different risk-benefit profile have metoidioplasty as an option. This procedure uses the hormonally enlarged clitoris as the basis for a smaller phallus rather than transplanting tissue from another body site. A systematic review comparing metoidioplasty to radial forearm flap phalloplasty found that metoidioplasty was more likely to be completed in a single surgical stage, had lower overall complication rates, was more likely to preserve erogenous sensation, and achieved standing urination at a higher rate.12PubMed Central. A Systematic Review of Metoidioplasty and Radial Forearm Flap Phalloplasty in Female-to-male Transgender Genital Reconstruction The trade-off is size: the resulting phallus is substantially smaller and generally not adequate for penetrative intercourse without a prosthetic device. That makes the choice a deeply personal one, balancing complication risk against functional goals.
Systemic and Life-Threatening Risks
The question most people really want answered when they ask if bottom surgery is “dangerous” is whether it might kill them or cause a medical emergency. The short answer: serious systemic complications are uncommon. Mortality and organ-system complications were infrequent in large cohort studies of gender-affirming bottom surgery.13PubMed. Preoperative hypocoagulative state is an independent risk factor for wound complications and infection in gender-affirming bottom surgeries
Venous thromboembolism, a blood clot in a vein that can travel to the lungs, is a concern for any major surgery. A retrospective analysis of a large insurance database found that about 1.1% of patients experienced a clot within 90 days of vaginoplasty. Nearly half of those patients had a history of prior blood clots. Older age, higher overall illness burden, and previous clotting events were all risk factors.14PubMed. Incidence and Risk Factors for Postoperative Venous Thromboembolism After Gender Affirming Vaginoplasty The question of whether to stop estrogen before surgery to reduce clot risk has been debated, but a systematic review found inconsistent evidence linking estrogen use to perioperative thrombosis and noted that the data doesn’t specifically address the types of estrogen most commonly used in gender-affirming care.15JAMA Surgery. Association of Surgical Risk With Exogenous Hormone Use in Transgender Patients: A Systematic Review Testosterone use was not found to be associated with increased risk of clotting or other surgical complications.
Pelvic Floor and Urinary Function After Surgery
Bottom surgery changes the anatomy of the pelvis, and that has downstream effects on urinary function. A systematic review and meta-analysis found that after vaginoplasty, urinary incontinence affected up to 15% of patients, urinary irritative symptoms affected up to 20%, and pelvic organ prolapse occurred in 1% to about 8% of patients. For transmasculine patients who had undergone phalloplasty, the numbers were notably higher: urinary incontinence affected up to half of patients, and irritative symptoms affected up to 37%.16PubMed. Pelvic floor and sexual dysfunctions after genital gender-affirming surgery: a systematic review and meta-analysis
A cross-sectional study of transfeminine patients found notable increases in urinary complaints after vaginoplasty, including more frequent urination, more effort needed to complete urination, and new episodes of urine leakage.17PubMed. Urinary, Bowel and Sexual Function of Transgender Women After Sex Reassignment Surgery Vaginoplasty These issues are rarely severe, but they can affect daily life and are underreported in consent discussions. Pelvic floor physical therapy, both before and after surgery, is increasingly recommended to improve these outcomes.
Sensory Outcomes and the Ability to Orgasm
Loss of sexual sensation is a common fear, and the evidence here is more reassuring than many people expect. After vaginoplasty, studies using nerve function testing confirmed that the sensory pathways to the genital area remain intact. Sensitivity at the neoclitoris was much higher than at the neovaginal or anal sites.18The Journal of Sexual Medicine. Genital Sensitivity and Perceived Orgasmic Intensity in Transgender Women with Gender Dysphoria After Gender-Affirming Surgery Broader reviews report that high rates of orgasmic ability are preserved after vaginoplasty, largely through the neoclitoris, and that the neovagina develops vibratory and pressure sensation.19Plastic and Reconstructive Surgery. Sensibility, Sensation, and Nerve Regeneration after Reconstructive Genital Surgery: Evolving Concepts in Neurobiology
For phalloplasty, sensory outcomes are more variable but still generally positive. The technique of burying the native clitoris at the base of the neophallus allows erogenous sensation to persist. One long-term follow-up from a major center found that all patients who could orgasm before surgery maintained that ability afterward, and prosthetic implant placement did not diminish erogenous sensation.20PubMed Central. Overall satisfaction, sexual function, and the durability of neophallus dimensions following staged female to male genital gender confirming surgery Over time, new nerve growth into the transplanted tissue can bring additional tactile sensation to the neophallus itself, though the degree varies and can take many months to develop.
Emerging Technique Variations in Vaginoplasty
The standard approach for vaginoplasty for decades has been penile inversion, where the penile skin is used to line the vaginal canal. A newer approach, robotic peritoneal flap vaginoplasty, uses tissue from the abdominal lining instead. Early comparative data show that peritoneal flap procedures yielded greater vaginal depth at both one and six months compared to penile inversion, with no rectal injuries in the peritoneal flap group versus three in the penile inversion group, and less blood loss overall.21PubMed. Robot-Assisted Peritoneal Flap Vaginoplasty Versus Penile Inversion Vaginoplasty for Gender Affirming Surgery Complication rates for stenosis, granulation tissue, and transfusion were similar between the two approaches.22PubMed. Comparing sexual outcomes and complications in Male-to-Female Gender-Affirming Surgery: penile inversion vs. robotic peritoneal vaginoplasty These findings are promising, but the data remain limited and drawn from relatively small studies. Which technique ends up being better for a given patient depends on factors like available tissue, surgical team expertise, and personal priorities around depth and lubrication.
Penile Implant Complications After Phalloplasty
Patients who want the ability to have penetrative intercourse after phalloplasty typically need a penile prosthetic device implanted in a later surgery. This introduces another layer of risk. Artificial stiffeners have historically been associated with high infection and failure rates and are best placed after the neophallus has regained some degree of sensation.23PubMed Central. Phalloplasty: The dream and the reality The prosthesis complication rate in a large meta-analysis sat close to 28%.9PubMed. A systematic review and meta-analysis of urethral complications and outcomes in transgender men Problems include mechanical malfunction, erosion through the skin, and infection requiring removal. Many patients go through more than one prosthetic device over their lifetime. Waiting until adequate healing and nerve regrowth has occurred before implanting the device can reduce complication rates, but it means a longer overall surgical timeline.
Regret and Psychological Outcomes
Complication risk doesn’t exist in a vacuum; it has to be weighed against the psychological benefit of resolving gender dysphoria. A meta-analysis of regret prevalence across gender-affirming surgeries found a pooled regret rate of about 1%. For vaginoplasty specifically, the rate was around 2%. For transmasculine surgeries, regret was under 1%.24PubMed Central. Regret after Gender-affirmation Surgery: A Systematic Review and Meta-analysis of Prevalence A study of gender-affirming mastectomy found that the median regret score was zero, and satisfaction with the decision was at the ceiling of the measurement scale.25JAMA Surgery. Long-Term Regret and Satisfaction With Decision Following Gender-Affirming Mastectomy
When dissatisfaction does occur, it tends to correlate with preoperative psychological symptoms or self-reported surgical complications. One follow-up study found postoperative satisfaction ranging from 94% to 100% depending on procedure type, but the small group reporting dissatisfaction was six times more likely to have had complications or pre-existing psychological difficulties.26PubMed. Surgical Satisfaction, Quality of Life, and Their Association After Gender-Affirming Surgery: A Follow-up Study This highlights something clinicians are increasingly recognizing: thorough preoperative mental health support and realistic complication counseling don’t just reduce regret, they likely improve how patients cope when complications do occur.
The Neovaginal Microbiome
An area of ongoing research that most patients don’t hear about before surgery involves the microbial community that colonizes a neovagina. Unlike a natal vagina, which is typically dominated by Lactobacillus bacteria that keep the environment acidic, a neovagina develops a distinct and more diverse microbial population. Studies have found the most abundant bacteria to include Porphyromonas, Peptostreptococcus, Prevotella, and Mobiluncus, with significantly higher microbial diversity than is seen in natal vaginas.27PubMed Central. The neovaginal microbiome of transgender women post-gender reassignment surgery A more recent study cataloging the core neovaginal microbiota identified 11 genera consistently present, with Peptoniphilus and Prevotella among the most common, and found that different bacterial clusters had different relationships with local immune responses.28Cell Reports. Neovaginal microbiota and immune profiles in transfeminine individuals
The surgical technique affects what kind of microbial community develops. Penile-inversion neovaginas tend to resemble natal vaginas with bacterial vaginosis, while intestinal vaginoplasty results in a microbiome more similar to the colorectum.29PubMed Central. The microbiome of the neovagina: a systematic review and comparison of surgical techniques In practical terms, this means the discharge, odor, and infection susceptibility of a neovagina are different from what standard gynecological guidance covers, and healthcare providers unfamiliar with trans patients may misinterpret normal neovaginal findings as pathological. Knowing that a neovagina has its own microbial normal can prevent unnecessary treatment and anxiety.
What Makes Complications More or Less Likely
Surgeon experience matters, though it’s hard to quantify precisely. One retrospective study of over 400 vaginoplasty patients analyzed risk factors for needing a surgical revision and found that younger age was the only factor significantly associated with early revision. Obesity and tobacco use, both commonly flagged as concerns, were not statistically significant risk factors for revision in that cohort.30PubMed Central. Analysis of surgical complications and risk factors in genital feminization surgery: a retrospective cohort study of 407 transgender women That finding goes against some of the standard preoperative warnings patients receive and underscores that the evidence base is still evolving. It doesn’t mean obesity and smoking are irrelevant to surgical healing in general, but it does suggest that for this specific surgery at experienced centers, those factors may be less decisive than commonly assumed.
The broader pattern across the literature is that center volume and surgical team experience appear to make a meaningful difference. Gender-affirming bottom surgery is technically demanding, and the learning curve is steep. Patients seeking surgery should ask about a surgeon’s case volume and complication rates, just as they would for any complex procedure. The field has grown rapidly, and not all centers performing these operations have equivalent track records.