Lordosis (Swayback)

What lordosis means

Seen from the side, the spine curves inward at the neck (cervical lordosis), outward at the upper back (kyphosis) and inward again at the lower back (lumbar lordosis). These curves spread the load of the upper body and absorb shock. A normal lumbar curve is roughly 40 to 60 degrees, with wide variation between people.

In everyday medical use, "lordosis" usually means too much inward curve in the lower back. Too little curve is called hypolordosis or "flat back". Loss of the normal neck curve on an X-ray (straightening of cervical lordosis) is common with neck muscle spasm and is a separate finding.

Signs of lordosis

• The lower back curves in sharply above the buttocks
• The buttocks stick out and the belly pushes forward
• When lying flat on your back on a firm floor, you can slide your hand easily under your lower back with room to spare
• Lower back ache or tightness, especially after standing
• Tight hip flexors and hamstrings

Simple check: stand with your back against a wall, heels about 5 cm (2 in) from the wall. If you can fit more than a hand's thickness between your lower back and the wall, your curve may be exaggerated.

Causes

Posture and muscle imbalance (most common)

The pelvis tips forward (anterior pelvic tilt) when:

• hip flexor muscles at the front of the hips are tight from long sitting
• abdominal and gluteal muscles are weak
• lower back muscles are tight

This pattern is sometimes called lower crossed syndrome.

Pregnancy and belly weight

The growing belly in pregnancy, or extra weight around the middle (obesity), shifts the center of gravity forward, and the lower back arches to compensate. Lordosis from pregnancy usually eases in the months after birth.

Spine conditions

• Spondylolisthesis: a vertebra slips forward on the one below, often in the lowest lumbar segment. It is common in young athletes who repeatedly arch the back, such as gymnasts, divers and football linemen.
• Kyphosis higher up: a rounded upper back is often balanced by a deeper lower curve.
• Discitis (disc infection) and some spine surgeries.

Hip and other conditions

• Hip flexion contracture, where the hip cannot straighten fully
• Developmental dysplasia of the hip
• Achondroplasia (a form of dwarfism)
• Neuromuscular conditions such as muscular dystrophy and cerebral palsy, where weak hip and trunk muscles force the back to arch

In children

Many toddlers and young children have a prominent swayback and potbelly that is completely normal and fades as they grow. It is of concern only if it stays fixed or comes with weakness, pain or other symptoms.

Lordosis vs kyphosis vs scoliosis

For a sideways curve, see scoliosis.

How lordosis is diagnosed

A doctor or physical therapist looks at your posture from the side, checks how your back moves, and asks you to bend forward. A flexible curve straightens on bending and is usually postural. A fixed curve stays and needs investigation. Leg strength, reflexes and sensation are tested.

A standing side X-ray measures the curve and shows spondylolisthesis or vertebral abnormalities. MRI is used if nerve compression or a disc or bone problem is suspected.

Treatment

Exercises for lordosis

The aim is to strengthen the muscles that tilt the pelvis back and stretch those that tilt it forward.

• Pelvic tilts: lie on your back with knees bent, flatten your lower back into the floor by tightening your belly, hold 5 seconds, repeat 10 times.
• Glute bridges: lift your hips from the floor while squeezing the buttocks, without arching the back.
• Dead bugs and planks: build deep core strength while keeping the spine neutral.
• Hip flexor stretch: in a half-kneeling lunge, tuck your pelvis and lean forward gently until you feel the front of the hip stretch; hold 30 seconds each side.
• Hamstring and lower back stretches: knees to chest, child's pose.

Do them most days. Improvement in posture and pain usually shows in 6 to 12 weeks.

Daily habits

• Break up long sitting every 30 to 60 minutes.
• Stand with weight even on both feet and knees soft, not locked.
• Wear low, supportive shoes. High heels increase the arch.
• Lose excess weight if you carry it around the middle.

Pain relief

Heat, acetaminophen (paracetamol) or ibuprofen at the label dose, and staying active help flare-ups of low back pain.

Medical and surgical treatment

Spondylolisthesis is treated with activity changes, physical therapy and sometimes a brace. Surgery (spinal fusion) is needed only for severe slips, ongoing pain despite treatment, or nerve compression. Neuromuscular and hip-related lordosis is managed by treating the underlying condition.

Frequently asked questions

Can lordosis be fixed?

Postural lordosis can usually be improved a great deal with core and glute strengthening, hip flexor stretches and better sitting habits, typically over 2 to 3 months. Lordosis caused by a structural problem such as spondylolisthesis may need specific medical treatment.

Is lordosis bad?

Some lordosis is normal and healthy. An exaggerated curve is not dangerous in itself but can contribute to lower back pain and fatigue. It matters more if the curve is fixed, painful, getting worse or linked to nerve symptoms, which need a medical check.

What causes swayback posture?

The most common causes are tight hip flexors from sitting, weak abdominal and buttock muscles, pregnancy and extra belly weight. Less often, it is caused by a slipped vertebra (spondylolisthesis), hip problems or muscle disorders.

Does lordosis go away after pregnancy?

Usually it improves gradually over the months after birth as the belly shrinks and core muscles recover. Postnatal core and pelvic floor exercises speed this up. Check with your doctor if back pain persists or you notice a gap between your abdominal muscles.