Adult scoliosis usually comes from wear and tear on the spine, not from something you were born with

Most adults who develop scoliosis did not have it as children. Instead, their spine curves because of changes that happen over decades—cartilage breaks down, bones shift, ligaments weaken, or one side of the spine degenerates faster than the other. This is called degenerative scoliosis, and it accounts for the majority of scoliosis cases in people over 50. The curve can start small and stay stable for years, or it can worsen gradually and cause pain, numbness, or difficulty walking.

A smaller group of adults develop scoliosis because of an underlying condition—osteoporosis, a previous spine surgery, a tumor, or an infection. Some people also have scoliosis from childhood that was never treated or diagnosed, and the curve gets worse as they age. Understanding which type you have matters because the cause shapes what happens next: whether you need monitoring, physical therapy, medication, or surgery.

Key Takeaways

  • Degenerative scoliosis, caused by aging and wear on the spine, is the most common type in adults and usually develops after age 50.
  • Osteoporosis, previous spine surgery, and spinal infections can all trigger scoliosis in adults who did not have it before.
  • A curve that was present in childhood but never treated will often worsen over time as the spine ages.
  • Pain and symptoms depend on whether the curve is pressing on nerves, not on the size of the curve itself.

Degenerative changes in the discs and joints

The most common cause of adult scoliosis is the breakdown of the discs and joints in your spine. Over time, the gel-like material inside each disc loses water and becomes less flexible. The outer ring of the disc can crack, and the disc itself shrinks. When this happens unevenly—faster on one side than the other—the vertebrae above and below tilt, and the spine curves.

At the same time, the small joints on the back of each vertebra (called facet joints) develop arthritis. The cartilage wears away, bone spurs form, and the joints become stiff and inflamed. If one side of the spine is more arthritic than the other, it can pull the vertebrae into a curve. This process usually takes years and is most common in people over 60, though it can start earlier.

Degenerative scoliosis often causes pain because the curve can narrow the spaces where nerves exit the spine. This narrowing, called spinal stenosis, may produce leg pain, numbness, or weakness—especially when you stand or walk for a long time. Lying down or bending forward usually makes these symptoms better.

Osteoporosis and vertebral compression fractures

Osteoporosis weakens bone throughout your body, including your spine. When bones become porous and brittle, the vertebrae can collapse or fracture even from minor falls or bumps. These compression fractures can cause one or more vertebrae to lose height on one side, which tilts the spine and creates a curve.

Compression fractures from osteoporosis are especially common in postmenopausal women, because estrogen loss accelerates bone loss. Men over 70 and anyone on long-term steroid medications (like prednisone) are also at higher risk. A single fracture may not cause much curve, but multiple fractures over time can add up to a noticeable scoliosis.

The fractures themselves often heal within a few months, but the curve they create is usually permanent. If you have osteoporosis and develop scoliosis, your doctor will likely recommend treatment to slow further bone loss and prevent more fractures.

Previous spine surgery or trauma

Scoliosis can develop years after spine surgery, a condition called adjacent segment disease. When vertebrae are fused together (a common surgical treatment for scoliosis, disc herniation, or instability), the segments above and below the fusion bear extra stress. Over time, these adjacent segments can degenerate faster, develop arthritis, and shift into a curve.

Severe spine injuries from accidents or falls can also lead to scoliosis later. If the injury damages the vertebrae, discs, or ligaments, the spine may become unstable. Even if the injury heals, the spine may not align properly, and a curve can develop months or years afterward.

Whiplash injuries, falls from height, and motor vehicle accidents are the most common causes of post-traumatic scoliosis. The risk is higher if the original injury was not fully treated or if you did not have imaging done at the time.

Spinal infections and inflammatory conditions

Infections of the spine—such as tuberculosis or bacterial infections of the vertebrae or discs—can destroy bone and cause the spine to collapse or shift. These infections are rare in developed countries but still occur, especially in people with weakened immune systems. When the infection heals, scar tissue forms and the vertebrae may fuse in a curved position.

Inflammatory conditions like ankylosing spondylitis (a type of arthritis that affects the spine) can also cause scoliosis. This condition causes inflammation and stiffness in the spine, and over time the vertebrae can fuse together in a curved or bent-forward position. Ankylosing spondylitis usually starts in younger adults but can worsen significantly by middle age.

Untreated childhood scoliosis that progresses with age

Some adults have scoliosis that started in childhood but was never diagnosed or treated. In children, curves often stop growing once the skeleton matures (usually by the late teens). However, curves that are moderate to severe at skeletal maturity tend to worsen by about 1 degree per year as the adult spine ages. A curve that was 40 degrees at age 18 may become 50 or 60 degrees by age 50.

Curves that were mild in childhood—under 20 degrees—usually stay stable or progress very slowly. But larger curves are more likely to cause pain and symptoms as you get older, because the degenerative changes described above happen on top of the existing curve. If you had scoliosis as a child and have not had imaging in many years, your doctor may recommend an X-ray to see whether the curve has changed.

Neuromuscular conditions and muscle weakness

Conditions that weaken muscles or affect nerve function can cause scoliosis in adults. Cerebral palsy, muscular dystrophy, and Parkinson's disease are examples. When muscles cannot support the spine properly, the vertebrae shift and curve. This type of scoliosis is less common than degenerative scoliosis but can develop at any age depending on when the underlying condition appears or worsens.

Spinal cord injury can also lead to scoliosis because the muscles that normally stabilize the spine no longer work. The curve may develop within months of the injury or years later, as the spine loses support and degenerative changes accelerate.

Tumors and other structural problems

Benign or cancerous tumors of the spine can destroy bone, weaken the vertebrae, or push the spine out of alignment. Scoliosis caused by a tumor usually develops quickly and may be accompanied by pain, neurological symptoms, or other signs of the tumor itself. If you develop a new curve along with unexplained pain or neurological changes, imaging is important to rule out a tumor or other serious cause.

Rarely, scoliosis can result from structural abnormalities that were present from birth but did not cause a noticeable curve until adulthood. These include vertebrae that did not form properly or are fused together in an unusual way. These cases are usually identified through imaging when you seek care for other reasons.

Frequently Asked Questions

Can poor posture cause scoliosis in adults?

Poor posture does not cause scoliosis, but it can make an existing curve more noticeable and may worsen pain. Scoliosis is a structural curve in the bone, not a postural habit. However, strengthening your core and maintaining good posture can reduce strain on a curved spine and may help manage symptoms.

Is adult scoliosis always painful?

No. Many adults have scoliosis and never experience pain. Pain occurs when the curve narrows the space for nerves or when degenerative changes cause inflammation. Some people have large curves with no symptoms, while others have small curves that cause significant pain. Symptoms depend on nerve involvement, not curve size.

Can scoliosis develop suddenly in an adult?

Degenerative scoliosis develops gradually over years, so it does not appear suddenly. However, a sudden event—like a compression fracture from osteoporosis or a spine injury—can cause a noticeable curve to appear over weeks or months. If your spine curves suddenly, see a doctor to identify the cause.

Does adult scoliosis always get worse?

Not always. Many adults with degenerative scoliosis have curves that stay stable for years or progress very slowly. Curves that worsen tend to do so at about 1 to 2 degrees per year, though some remain unchanged. Your doctor can track your curve with periodic X-rays to see whether it is stable or changing.

What should I do if I think I have developed scoliosis?

See your primary care doctor or a spine specialist. They will take a history, examine your spine, and order X-rays to confirm whether you have scoliosis and measure the curve. Imaging also helps identify the cause—whether it is degenerative changes, osteoporosis, a previous injury, or something else. Once the cause is known, your doctor can discuss whether monitoring, physical therapy, or other treatment is needed.