Adults develop scoliosis in two main ways: either a childhood curve carries into adulthood and slowly worsens, or the spine develops a brand-new curve due to age-related wear and tear. The second type, called degenerative scoliosis, is surprisingly common. One study found that up to 68% of otherwise healthy adults over 60 had some degree of spinal curvature. A curve of 10 degrees or more on an X-ray is the threshold for a clinical scoliosis diagnosis.
Degenerative Scoliosis: The Most Common Adult Type
The most frequent way adults develop scoliosis has nothing to do with childhood posture or carrying heavy bags. It starts with the discs between your vertebrae. These discs act as cushions, and over decades they gradually dry out and lose height. The key factor isn’t just that degeneration happens, it’s that it happens unevenly. When the disc on one side of a vertebra wears down faster than the other side, the spine starts to tilt. The same uneven process affects the facet joints, the small interlocking joints at the back of each vertebra that guide spinal movement.
This asymmetric breakdown is the core mechanism. One side of the spine loses structural support faster than the other, and the resulting imbalance creates a lateral curve that can progress over years. The process is essentially the same arthritis that affects knees and hips, just happening in the spine in a lopsided pattern. Standing and walking load the weakened side further, which can accelerate the tilt.
Childhood Curves That Progress in Adulthood
If you had scoliosis as a teenager, your curve didn’t necessarily stop changing when you stopped growing. Curves between 40 and 50 degrees at skeletal maturity tend to keep progressing, typically at an average rate of about 1.5 degrees per year. In faster-progressing cases, that rate jumps to around 3 degrees per year. Over a decade or two, that’s enough to turn a moderate curve into a severe one.
Smaller adolescent curves (under 30 degrees) are less likely to worsen significantly in adulthood, but they’re not immune to the degenerative changes that affect everyone’s spine with age. So even a mild childhood curve can become symptomatic later in life as arthritis compounds the existing asymmetry.
Osteoporosis and Compression Fractures
Weakened bones are another pathway to adult scoliosis. Osteoporosis, which affects an estimated 15 to 20 million people in the United States, causes bones to lose both mineral content and protein structure. When vertebrae become fragile enough, they can fracture under minimal force, sometimes just from bending over or even from no identifiable trauma at all. More than 500,000 people with osteoporosis suffer spinal fractures each year.
These fractures typically compress one side of the vertebra more than the other, creating a wedge shape visible on X-rays. Stack a few wedge-shaped vertebrae on top of each other and the spine curves. This is most common in postmenopausal women, though men with osteoporosis face the same risk. Unlike degenerative scoliosis, which develops gradually over years, fracture-related curvature can appear relatively quickly after a series of compression fractures.
Lifestyle Factors That Raise Your Risk
Not everyone’s spine degenerates at the same rate, and several factors influence how quickly yours might develop a curve.
Smoking is one of the more significant modifiable risks. The chemical processes that break down elastic tissue in the lungs (the same ones responsible for emphysema) can also be absorbed into the connective tissue of the spine, weakening the structures that hold vertebrae in alignment. Smokers consistently show more degenerative spinal disease than nonsmokers.
Physically demanding jobs also play a role. Repetitive strain, heavy lifting, and years of high-impact activity can accelerate uneven disc and joint degeneration. Minor traumas that seem insignificant at the time can accumulate and contribute to spinal instability. Aging itself is the biggest risk factor, but these lifestyle elements determine how aggressively the process unfolds.
What Adult Scoliosis Feels Like
Adult scoliosis often announces itself through back pain rather than a visible curve. The specific pattern of pain depends on which structures are affected. When arthritis develops in the facet joints, pain tends to worsen with standing or arching the back. This is essentially the same bone-on-bone grinding that causes pain in arthritic knees. When the discs are the primary problem, pain is often worse when sitting or bending forward, because those positions load the damaged disc.
As the curve progresses, it can narrow the spinal canal or the openings where nerves exit the spine. This compression causes symptoms that extend beyond the back: shooting leg pain, numbness, tingling, or weakness in the legs. Some people notice these nerve symptoms before they’re ever aware of a spinal curve. Others experience a gradual change in posture, like a noticeable lean to one side or difficulty standing fully upright.
How Adult Scoliosis Is Managed
Treatment depends on the severity of the curve, how fast it’s progressing, and whether it’s causing pain or nerve symptoms. Many adults with mild curves (under 25 to 30 degrees) that aren’t progressing or causing problems simply monitor the curve with periodic X-rays. This might mean imaging every few months initially, then stretching to once a year or less once the pattern is established.
For painful but moderate curves, the focus is on physical therapy to strengthen the muscles supporting the spine, pain management, and sometimes bracing. Braces in adults won’t straighten the curve, but they can support the spine and reduce muscle spasms that contribute to pain.
Surgery becomes a consideration when pain or disability persists despite months of conservative treatment, when nerve compression causes progressive weakness, or when the curve is large enough that the spine’s overall balance is significantly disrupted. The goal of surgery is to stabilize the spine and restore alignment, but it’s typically reserved for cases where the functional impact on daily life is substantial. Recovery from adult scoliosis surgery is considerably longer than in adolescents, which is why surgeons and patients tend to exhaust nonsurgical options first.