Scoliosis can cause a wide range of problems beyond the curved spine itself, from breathing difficulties and nerve pain to heart strain and significant emotional distress. The effects depend largely on the severity of the curve, where it occurs along the spine, and whether it develops during adolescence or later in adulthood. A curve is clinically diagnosed at 10 degrees or more, but many of the more serious complications tend to emerge as curves progress well beyond that threshold.
Breathing and Lung Function
When scoliosis occurs in the upper and middle back (the thoracic spine), it can reshape the rib cage and reduce the space your lungs have to expand. As the spine curves sideways, it also rotates, pushing the ribs outward on one side and inward on the other. This distortion compresses lung tissue, making it harder to take a full breath. Surgical treatment is typically considered once a curve exceeds 45 to 50 degrees, in part to prevent this kind of long-term breathing compromise.
Interestingly, the relationship between curve size and lung impairment isn’t perfectly predictable. Research published in The Spine Journal found no simple linear link between the degree of curvature and the degree of lung capacity loss. That means a person with a moderate curve could have noticeably reduced breathing capacity while someone with a larger curve might not. Other factors, including the flexibility of the rib cage and overall fitness, play a role.
Nerve Compression and Pain
As the spine shifts out of alignment, bones can press on nearby nerves. This can produce radiating pain that travels down the arms or legs, along with tingling, numbness, or weakness in the hands and feet. A pinched nerve isn’t guaranteed with scoliosis, but any change in spinal alignment raises the risk.
These neurological symptoms are more common in adults with degenerative scoliosis, where age-related changes like disc bulging, joint arthritis, and thickening of the ligaments within the spinal canal compound the curvature. Together, these changes can narrow the spinal canal (a condition called spinal stenosis), squeezing the nerves even further. The combination of curvature and degeneration is a major source of back and leg pain in older adults.
Heart and Cardiovascular Strain
Severe thoracic scoliosis doesn’t just compress the lungs. It also changes the shape of the chest cavity enough to physically squeeze the heart. A study published in Open Heart used 3D cardiac modeling to show that scoliosis creates increased strain on the top and bottom of the heart while decompressing the sides. The abnormal curvature of the spine increases mechanical constraint on the heart, which can interfere with how the heart relaxes and fills with blood between beats. More severe spinal deformities have been shown to worsen pressure in the heart’s chambers.
The same research identified an increased lifetime risk of major cardiovascular events in people with scoliosis. However, the compression did not appear to alter blood flow through the heart in a measurable way, suggesting the effects may be subtle and cumulative rather than immediately dangerous.
Visible Physical Changes
Some of the most noticeable effects of scoliosis are postural. As the spine curves and rotates, the body compensates in ways that become visible, particularly when bending forward. Common changes include:
- Uneven shoulders, with one sitting higher than the other
- Uneven hips, creating a tilted pelvis
- A rib hump, where ribs on one side protrude outward due to spinal rotation
- A noticeable lean to one side
The rib hump is one of the hallmarks of moderate to severe scoliosis. It forms because spinal rotation pulls the attached ribs with it, pushing them backward on one side of the body and forward on the other. This asymmetry tends to become more pronounced as a curve progresses.
Mental Health and Body Image
The psychological impact of scoliosis, especially during adolescence, is significant and often underrecognized. About 72% of teens diagnosed with scoliosis report feeling psychologically affected by wearing a brace. The effects go far beyond mild discomfort. In one study of adolescent girls undergoing brace treatment, 42% reported staying home out of embarrassment, 35% missed school because of their brace, and 41% found it harder to socialize with peers. Three-quarters changed what clothes they wore, and 69% felt noticeably different from their peers.
Larger curves and longer bracing periods correlate with more severe depression. Girls tend to be hit harder than boys: they report worse body image, more concern with physical appearance, and greater avoidance of social activities. Boys with scoliosis generally report better self-image, less pain, and better mental health overall.
Perhaps the most striking finding is how little support these adolescents receive. Only 5% of teens in one study said they’d had a chance to discuss their emotional concerns with a healthcare provider, despite 90% wanting that opportunity. Quality of life scores showed a persistent negative relationship with body image across appearance, perceived deformity, and future expectations, and this held steady over 18 months of brace treatment rather than improving with time.
Effects in Older Adults
Scoliosis that develops in adulthood, often called degenerative or “de novo” scoliosis, brings its own set of problems. It typically appears in the lower back and results from the cumulative breakdown of discs and joints rather than abnormal growth. The degenerative process, including disc bulging, facet joint arthritis, and thickening of spinal ligaments, frequently produces symptoms of spinal stenosis: pain, heaviness, or weakness in the legs that worsens with standing or walking and eases with sitting.
Surgical treatment for degenerative scoliosis with stenosis has reported satisfactory outcomes in 83% to 96% of cases, though complication rates are higher than for scoliosis surgery in younger patients. The primary goal of treatment is pain relief and improved daily function with the least invasive approach possible.
Pregnancy Complications
Most women with scoliosis have straightforward pregnancies and deliver vaginally without significant complications. As long as oxygen levels and heart function are adequate, the baby’s growth isn’t typically threatened, since the expanding uterus adapts to the mother’s body shape.
Women with more severe curves may need to deliver before 37 weeks, because the growing baby and uterus can put additional strain on already-compromised breathing. During labor, staying in one position for extended periods tends to be particularly uncomfortable for women with scoliosis, so movement is encouraged.
Epidural pain relief is available for women with uncorrected scoliosis, though insertion can be technically challenging when the curve is severe, sometimes requiring ultrasound guidance. For women who’ve had spinal fusion surgery with rods and screws, the situation is more complex. If the hardware extends into the lower back, an anesthesiologist may recommend alternative pain relief to avoid complications like failed epidural placement, headaches from scar tissue, or infection risk around the metalwork.