Lumbar lordosis is not bad. It’s the natural inward curve of your lower back, and everyone has one. A healthy lumbar spine curves between 40 and 60 degrees, and this shape is essential for absorbing shock, distributing your body weight, and keeping you upright. The curve only becomes a problem when it’s significantly exaggerated (hyperlordosis, or “swayback”) or flattened out (hypolordosis, or “flat back”), both of which can shift your posture out of alignment and contribute to pain.
What a Normal Lumbar Curve Looks Like
Your spine isn’t meant to be straight. It has a series of curves that work together like a spring, and the lumbar lordosis is one of the most important. In a study of 200 healthy adults aged 16 to 72, the average lumbar lordosis measured about 50 degrees using the standard Cobb angle method, with a wide range of normal variation. The Cleveland Clinic considers 40 to 60 degrees typical for the lumbar spine.
That range matters because people often see the word “lordosis” on an imaging report and assume something is wrong. In most cases, the report is simply describing anatomy. The curve itself is a feature, not a flaw.
When the Curve Becomes a Problem
An excessive lumbar curve, called hyperlordosis or swayback, pushes your hips and pelvis forward, making you stand with your stomach jutting out and your backside sticking behind you. If you lie flat on the floor, you’ll notice a larger-than-normal gap between your lower back and the ground. Many people with hyperlordosis have no symptoms at all. When symptoms do appear, they typically include low back pain and restricted mobility. In rare, severe cases, the curvature can interfere with bladder or bowel control.
A flattened lumbar curve, or hypolordosis, is the opposite problem. Your lower back loses its natural arch, which reduces the spine’s ability to absorb forces during walking, running, or lifting. A meta-analysis published in The Spine Journal found that people with low back pain actually had smaller lumbar curves than healthy controls. Among specific conditions, disc herniation and disc degeneration were substantially associated with this loss of curvature. In other words, too little curve can be just as problematic as too much.
What Causes an Excessive Curve
Hyperlordosis usually comes down to muscle imbalances around the pelvis. Your lumbar curve is shaped by a tug-of-war between muscles on the front and back of your body. When certain muscles get tight and their opposites get weak, the pelvis tilts forward, dragging the lower spine into a deeper arch.
The typical pattern looks like this: tight hip flexors (the deep muscles connecting your spine to your thigh bone), tight lower back muscles, and a tight rectus femoris (the muscle running down the front of your thigh). On the weak side, you’ll find underactive abdominals, glutes, and hamstrings. Tight hip flexors are especially influential because they attach directly to the front of the lumbar vertebrae and discs. When they shorten, they compress the joints at the back of the spine and pull the pelvis into a forward tilt.
Even your feet play a role. Overpronation, where the arches of your feet collapse inward, increases internal rotation of the legs, which places tension on the hip flexors and can amplify the lumbar curve.
Abdominal Weight and the Spine
Carrying extra weight around the midsection shifts your center of gravity forward, forcing the lower back to compensate with a deeper curve. Research published in Applied Sciences found a positive link between abdominal obesity, increased lumbar curvature, and the development of low back pain. The mechanism is straightforward: the weight of the abdomen pulls on the spine while the abdominal muscles relax and weaken, doubling the biomechanical stress on the lumbar region. Lumbar curvature was directly affected by BMI, waist circumference, and waist-to-height ratio.
Sitting, Standing, and Daily Pain
If your lumbar curve is exaggerated, prolonged standing tends to make things worse because gravity pulls your pelvis further forward over time. You may notice that your lower back aches more after standing in a kitchen or waiting in a line than it does after a walk, since walking engages the glutes and shifts pelvic position. Sitting with poor support can also be uncomfortable, though for the opposite reason: most chairs flatten the lumbar curve, which stresses the discs. A small lumbar roll or rolled-up towel behind your lower back helps maintain the spine’s natural shape without overcorrecting it.
Switching positions frequently matters more than finding one “perfect” posture. Alternating between sitting, standing, and walking throughout the day keeps the muscles around the pelvis from locking into any single pattern.
Does Pregnancy Change the Curve?
This is a common concern, and the answer is more nuanced than most people expect. A study tracking spinal changes across all three trimesters found no statistically significant increase in lumbar lordosis during pregnancy. The bigger postural shift was an increase in thoracic kyphosis (the upper back rounding forward), likely to counterbalance the weight of the growing abdomen. Comparisons between pregnant, postpartum, and women who had never been pregnant showed no lasting changes in lumbopelvic position, which is reassuring for anyone worried about permanent spinal changes after childbirth.
Correcting an Exaggerated Curve
Because hyperlordosis is largely driven by muscle imbalances, the most effective approach targets those imbalances directly. The goal is to strengthen the muscles that tilt the pelvis backward (abdominals, glutes, hamstrings) and stretch the muscles pulling it forward (hip flexors, lower back extensors, quads).
The pelvic tilt is the foundational exercise. Lie on your back with your knees bent, then flatten your lower back against the floor by tightening your abdominals and gently tilting your pelvis upward. Hold for up to 10 seconds and repeat. This movement teaches you what a neutral pelvis feels like and activates the deep core muscles that support the lumbar spine. Once this feels easy, you can progress to glute bridges, dead bugs, and bird-dogs, all of which reinforce the same pelvic alignment under increasing demand.
Stretching the hip flexors is equally important. A half-kneeling lunge stretch held for 30 to 60 seconds per side, done daily, can gradually restore length to these muscles. Foam rolling the quads and lower back helps release tension between stretching sessions.
For people whose lordosis is worsened by abdominal weight, even modest reductions in waist circumference can meaningfully decrease the mechanical load on the lumbar spine. The relationship between abdominal fat and spinal curvature is direct enough that weight management counts as a spinal health strategy, not just a general wellness goal.
When Treatment Goes Beyond Exercise
Most cases of hyperlordosis respond well to consistent stretching and strengthening over several weeks to months. But when the curve is caused by a structural issue, such as spondylolisthesis (where one vertebra slips forward over another), a fracture, or a neuromuscular condition, exercise alone may not be enough. Physical therapy with hands-on manual techniques, bracing in adolescents who are still growing, and in rare cases surgical correction may be considered. The distinguishing factor is whether the curve is “flexible” (it reduces when you bend forward or lie down) or “fixed” (it stays the same regardless of position). Flexible curves almost always improve with conservative care.