Gonadal Dysgenesis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Gonadal Dysgenesis?
An endocrinologist (a doctor who treats hormone problems) often leads care. A geneticist (a doctor who studies inherited conditions) may help find the cause. A gynecologist (a doctor who treats the female reproductive organs) may also help. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is gonadal dysgenesis?
The gonads are the ovaries or testes. Gonadal dysgenesis is a congenital disorder. It is characterized by extremely hypoplastic gonads. The medical term dysgenesis means "abnormal development."
Swyer syndrome is a condition that affects sex development. It is also called 46,XY complete gonadal dysgenesis. It occurs in approximately 1 in 80,000 people.
Swyer syndrome is one form of gonadal dysgenesis and is the main focus here. Turner syndrome, which also affects the ovaries, is described below.
Symptoms
People with Swyer syndrome have female external genitalia and some female internal reproductive structures.
- Their gonads are not functional.
- The gonads are small and underdeveloped and contain little gonadal tissue.
- These structures are called streak gonads.
- Women with Swyer syndrome do not produce eggs (ova).
- A child may not go through puberty as usual.
Causes and who gets it
Chromosomes contain the genetic instructions for how the body develops and functions. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes. In Swyer syndrome, people have one X chromosome and one Y chromosome in each cell. This is the pattern typically found in boys and men. However, they have female reproductive structures.
In many people with Swyer syndrome, the cause is unknown. Variants in one of several genes have been found to cause the condition in some people. Variants in the SRY gene have been found in approximately 15 percent of people with Swyer syndrome. The SRY gene is located on the Y chromosome. Variants in the MAP3K1 gene may account for up to 18 percent of cases. Changes affecting other genes have also been identified in a few people with Swyer syndrome. Most cases of Swyer syndrome are not inherited. They occur in people with no history of the condition in their family.
Turner syndrome is a related chromosomal condition. One X chromosome is missing or altered. The ovaries often work less well. Many girls and women do not go through puberty unless they take hormone therapy. One-third to one-half of people with Turner syndrome are born with a heart defect. About 30 percent have a webbed neck, skeletal problems, or kidney problems.
How doctors diagnose it
Swyer syndrome may be identified before birth, at birth, or later. It may be found when a child does not go through puberty as usual.
Treatment
The gonads do not make hormones, so hormone therapy may be used to start puberty. It causes the breasts and uterus to grow, and eventually leads to menstruation. Hormone therapy can also help to reduce the risk of low bone density. The streak gonadal tissue is at risk of developing cancer that is often hard-to-detect, so it is usually removed surgically. Women with Swyer syndrome may be able to become pregnant with a donated egg or embryo if they have a uterus.
When to see a doctor
See a doctor if a child does not go through puberty as usual. Heart defects in Turner syndrome can cause life-threatening complications. Hormone therapy may be used to start puberty.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Such a doctor can help with a first visit, follow-up visits, and talking with specialists.
Common questions
What is Swyer syndrome?
Swyer syndrome is a condition that affects sex development. It is also called 46,XY complete gonadal dysgenesis.
Can someone with Swyer syndrome become pregnant?
A person with Swyer syndrome may become pregnant if they have a uterus, using a donated egg or embryo. Women with Swyer syndrome do not produce eggs.
How is puberty started in Swyer syndrome?
Hormone therapy may be used to start puberty. It can also help to reduce the risk of low bone density.
Is Swyer syndrome passed down in families?
Most cases of Swyer syndrome are not inherited. They occur in people with no history of the condition in their family.
Is Turner syndrome the same as Swyer syndrome?
No. Turner syndrome is a different condition. In it, one X chromosome is missing or altered. In Swyer syndrome, people have one X and one Y chromosome.
Sources
- National Organization for Rare Disorders - gonadal dysgenesis
- MedlinePlus Genetics - Swyer syndrome
- MedlinePlus Genetics - Turner syndrome
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
