Kyphosis is an excessive forward rounding of the upper back. Everyone’s thoracic spine (the middle and upper portion) has a natural outward curve, but when that curve becomes exaggerated, it creates a visible hunch and can lead to stiffness, pain, or in severe cases, breathing problems. The condition ranges from mild postural rounding that corrects when you stand up straight to rigid structural curves that require medical treatment.
Types of Kyphosis
Postural Kyphosis
This is the most common and least serious form. It’s essentially what people mean by “poor posture.” The key feature is that the curve is flexible: if you consciously stand upright, the rounding disappears. The bones and discs of the spine are structurally normal, and most people with postural kyphosis have no symptoms beyond the visible slouch. It’s especially common in adolescents and in adults who spend long hours sitting or looking at screens.
Scheuermann’s Kyphosis
Unlike postural kyphosis, Scheuermann’s disease involves a structural change in the vertebrae themselves. During adolescence, the front edges of several vertebrae grow more slowly than the back edges, causing them to become wedge-shaped. The diagnostic criteria are specific: at least three adjacent vertebrae must each show 5 degrees or more of wedging, with a rigid curve exceeding 40 degrees overall. Because the vertebrae are physically misshapen, this type of kyphosis doesn’t correct when you try to stand straight. It often first becomes noticeable during the teenage growth spurt and tends to be more common in boys.
Congenital Kyphosis
This form is present at birth. It happens when one or more vertebrae don’t form completely or don’t separate properly during fetal development. Because the malformation exists from the start, congenital kyphosis can worsen quickly as a child grows. Surgery during childhood is often recommended to correct the curve before it progresses further.
Age-Related Kyphosis
Older adults, particularly postmenopausal women, can develop kyphosis as osteoporosis weakens the vertebrae. Weakened bones may partially collapse under normal body weight, creating compression fractures that tilt the spine forward. Research on postmenopausal women found that those with moderate kyphosis were nearly 5 times more likely to have vertebral fractures than those with mild curves, and women with severe kyphosis were more than 10 times more likely. This progressive rounding, sometimes called a “dowager’s hump,” tends to worsen as more fractures accumulate.
Symptoms and Complications
Mild kyphosis often produces no symptoms at all beyond the visible curve. As the rounding increases, though, you may notice stiffness or aching in the upper back, tightness in the hamstrings, and fatigue after sitting or standing for long periods. Some people experience pain where the curve is sharpest, while others feel it in the lower back, which has to arch more than usual to compensate for the forward tilt above.
Severe kyphosis, particularly curves exceeding 75 degrees, can compress the chest cavity enough to limit lung function. Studies on patients with Scheuermann’s disease found that those with curves above 75 degrees showed significantly reduced aerobic capacity and lower maximum ventilation. Their cardiovascular efficiency also dropped, meaning the heart had to work harder to deliver the same amount of oxygen during exercise. In rare cases, very large curves can put pressure on the spinal cord or nerve roots, causing numbness, tingling, or weakness in the legs.
How Kyphosis Is Diagnosed
Diagnosis usually starts with a physical exam. Your doctor will likely ask you to bend forward at the waist (the Adam’s forward bend test), which makes a rounded curve easier to see. A simple but telling part of the exam is asking you to stand as straight as you can. If the curve disappears, it’s likely postural. If it stays, a structural cause is more probable.
X-rays confirm the diagnosis and measure the severity. The standard measurement is the Cobb angle, taken from a side-view X-ray. A radiologist draws lines along the top edge of the uppermost tilted vertebra and the bottom edge of the lowest one, then measures the angle where those lines would intersect. This number guides all treatment decisions going forward.
Treatment Without Surgery
For postural kyphosis and mild structural curves, physical therapy is the first line of treatment. The goal is to strengthen the muscles that run along the spine (the spinal extensors), improve how well those muscles activate during everyday movements, and restore mobility to stiff segments of the upper back. A randomized controlled trial found that a three-month program targeting these muscles produced measurable improvements in both spinal curvature and physical performance in older adults with hyperkyphosis.
The exercise approach goes beyond simple back extensions. Effective programs also incorporate postural training, teaching you to align your head over your pelvis and to maintain a neutral spine position while bending, lifting, and performing daily tasks. The improvements researchers observed may have been driven as much by retraining how the brain activates spinal muscles as by raw strength gains.
For adolescents with moderate Scheuermann’s kyphosis who are still growing, bracing can slow or halt curve progression. A thoracolumbosacral orthosis (a rigid brace covering the torso) is typically worn 18 to 22 hours per day. Nighttime-only braces, worn for about 8 hours while sleeping, have shown comparable effectiveness in preventing curves from getting worse, though there may be a slightly higher chance of eventually needing surgery compared to full-time bracing.
When Surgery Is Considered
Surgery becomes a serious option when the thoracic curve exceeds about 70 degrees, though the exact threshold varies. Most spine surgeons agree that curves above 70 degrees in Scheuermann’s disease warrant surgical discussion, especially when combined with pain that hasn’t responded to months of physical therapy, neurological symptoms, breathing limitations, or significant dissatisfaction with appearance.
Another factor surgeons evaluate is whether the lower back has maxed out its ability to compensate. Your lumbar spine naturally arches in the opposite direction to balance the thoracic curve, but there’s a limit. If X-rays show that your lower back is already as extended as it can go, both while standing and while lying flat, you’ve reached your body’s natural limit of compensation. At that point, continuing without surgery risks accelerated wear and degeneration in the lumbar spine.
The procedure is a spinal fusion, where the surgeon straightens the curved section and locks the corrected vertebrae together using rods and screws. Recovery involves several months of restricted activity, and you’ll permanently lose some flexibility in the fused segment. For congenital kyphosis, surgery is often performed earlier in childhood to prevent the curve from worsening during growth spurts.