Turner syndrome produces a wide range of symptoms that shift with age, from swollen hands and feet at birth to short stature in childhood, absent puberty in the teen years, and ongoing health risks in adulthood. It affects roughly 1 in 2,000 to 2,500 girls and results from a missing or partially missing X chromosome. Because symptoms vary so much from person to person, some girls are diagnosed before birth while others aren’t identified until adolescence or later.
Signs at Birth and in Infancy
Some newborns show clear signs right away. Swelling of the hands and feet, called lymphedema, is one of the earliest markers, along with an unusually wide or webbed neck and heart problems detected shortly after delivery. About 30% of individuals with Turner syndrome have extra folds of skin on the neck, a low hairline at the back of the head, lymphedema, skeletal differences, or kidney problems.
Heart defects are common enough that they sometimes trigger the initial diagnosis. A narrowing of the body’s main artery (aortic coarctation) occurs in 7% to 18% of those with Turner syndrome, and 15% to 30% have an aortic valve with two flaps instead of the usual three. These conditions may need monitoring or treatment early in life.
Childhood Symptoms
Girls with Turner syndrome typically grow at a normal pace for the first three years, then their growth rate slows noticeably. By school age, they’re shorter than their peers, and they won’t experience the usual growth spurt at puberty without treatment. Short stature is the single most consistent feature of the condition.
Ear infections are strikingly common. Between 61% and 88% of girls experience recurrent acute ear infections, and middle ear fluid is present in 55% to 78% of girls under 16. More concerning, a progressive form of hearing loss that normally appears in old age can begin in girls as young as six. This type of hearing loss affects high-pitched sounds first and has been detected in 58% of girls under 16.
Kidney differences, including a horseshoe-shaped kidney where the two kidneys are fused at the base, can also be present from birth but are often discovered during routine imaging in childhood.
Puberty and Adolescence
The hallmark symptom in the teen years is the absence of spontaneous puberty. Roughly 70% to 80% of girls with Turner syndrome do not develop breasts or begin menstruation on their own, and about 90% experience a complete absence of periods. This happens because the ovaries typically don’t function as expected, a condition called primary ovarian insufficiency. Hormone therapy can initiate and sustain puberty, but without it, these milestones simply don’t occur.
Scoliosis, a sideways curve of the spine, develops in about 10% of adolescent girls with Turner syndrome. Bone health is a broader concern as well. Low bone density and osteoporosis appear two to three decades earlier than they would in other women after menopause, with thinning of the outer layer of bone detected even in teens and young adults.
Physical Features
Not every girl with Turner syndrome looks the same, but several physical traits appear frequently enough to help with recognition:
- Webbed neck: extra folds of skin on the sides of the neck
- Low hairline: hair at the back of the neck grows lower than usual, particularly on the sides
- Broad chest with widely spaced nipples
- Arms that angle outward slightly at the elbow
- Swollen hands and feet, especially noticeable in infancy
These features vary in how obvious they are. Some girls have several, others have few or none, which is one reason the condition can go undiagnosed for years.
Hearing Loss Over Time
Hearing problems don’t stop after childhood. The progressive high-frequency hearing loss worsens faster than normal age-related hearing decline. By ages 16 to 34, it’s present in 78% of women with Turner syndrome. This means regular hearing assessments are an important part of long-term care, and many women eventually benefit from hearing aids.
Cognitive and Social Patterns
Overall intelligence is typically in the normal range, and verbal skills tend to be a strength. The challenges show up in more specific areas. Over half of individuals tested show weaknesses in spatial reasoning, visual-motor tasks, math, and executive function (the mental skills involved in planning, organizing, and staying focused). About one-third fit a pattern called a nonverbal learning disability, where spoken and written language skills are solid but tasks involving spatial or visual processing are significantly harder.
Social situations can also be tricky. Difficulty reading facial expressions, picking up on subtle social cues, and recognizing emotions like fear in others has been documented. These challenges can make forming close friendships harder, though they vary widely from person to person. Diagnoses of ADHD and anxiety disorders each occur in about 26% of those with Turner syndrome, specific learning difficulties in math in 18%, and autism spectrum disorder in about 16%.
Thyroid and Metabolic Health
An underactive thyroid affects up to 70% of women with Turner syndrome, often caused by the immune system attacking the thyroid gland. Symptoms of low thyroid function (fatigue, weight gain, feeling cold, dry skin) can overlap with other aspects of Turner syndrome, so routine thyroid screening is standard practice. The condition is treatable with daily thyroid hormone replacement.
Fertility
Most women with Turner syndrome are unable to conceive naturally because of early loss of ovarian function. The vast majority experience primary ovarian insufficiency, meaning the ovaries stop working well before the typical age of menopause. A small percentage of women, particularly those with mosaic Turner syndrome (where only some cells are missing an X chromosome), retain some ovarian function and may have a window of natural fertility, but this is the exception.
How It’s Diagnosed
A standard chromosome analysis, called a karyotype, confirms the diagnosis. More than half of those with Turner syndrome are missing one X chromosome entirely (written as 45,X). Others have mosaic patterns where some cells have the typical two sex chromosomes and others don’t. Less common variations include a partially deleted or rearranged X chromosome. The specific chromosome pattern can influence which symptoms appear and how severe they are, with mosaic forms often producing milder features.