What is the reason why the waist cannot be straight when standing?

Unstraight waist may be caused by lumbar muscle strain, lumbar disc herniation, osteoporosis, ankylosing spondylitis, congenital spinal deformity and other reasons.

1. Lumbar muscle strain:

Maintaining poor posture or overexertion for a long time may cause damage to the lower back muscles and ligaments. Weakened waist muscle strength will affect the stability of the spine, manifesting as the inability to straighten the waist when standing. It is necessary to avoid sitting and standing for long periods of time in daily life. Symptoms can be relieved through hot compresses and massage. In severe cases, rehabilitation training is required under the guidance of a doctor.

2. Lumbar disc herniation:

Disc degeneration or trauma may cause the nucleus pulposus to herniate and compress the nerve root. In addition to limited waist movement, it is often accompanied by radiating pain or numbness in the lower limbs. Mild herniation can be relieved by bed rest and traction treatment. If symptoms of cauda equina nerve compression occur, minimally invasive surgical intervention should be considered.

3. Osteoporosis:

The loss of calcium leads to a decrease in the load-bearing capacity of the vertebral body, which can easily lead to vertebral body compression fractures. Middle-aged and elderly patients may experience symptoms such as shortening of height and worsening of hunchback. Bone density testing is required, and calcium and vitamin D supplements are required to prevent falls and reduce the risk of fractures.

4. Ankylosing spondylitis:

Autoimmune diseases mainly affect the sacroiliac joints and spine. The early symptoms include morning stiffness and low back pain, and in the later stages, bamboo-like changes in the spine may occur. A blood test for HLA-B27 antigen is required, nonsteroidal anti-inflammatory drugs can relieve symptoms, and biologics can slow the progression of the disease.

5. Congenital spinal deformity:

Adolescent idiopathic scoliosis or congenital hemivertebrae may cause the trunk to tilt. Deformities tend to worsen during rapid growth during adolescence, manifested by unequal shoulders and bulging ribs. Medial curvatures below 20 degrees can be corrected through physical training, and braces or surgical correction are required for curves above 40 degrees.

It is recommended to maintain regular exercise to strengthen the core muscles. Low-impact exercises such as swimming and plank support are suitable for waist health. Pay attention to maintaining a correct sitting posture every day, avoid bearing weight on one side, and choose a mattress with moderate hardness for sleeping. Increase the intake of calcium-containing foods such as dairy products and dark green vegetables in the diet. It is recommended that people over 50 years old undergo bone density screening every year. If you experience persistent low back pain accompanied by limited mobility, waking up with pain at night, or having bowel and bladder dysfunction, you need to seek medical attention promptly to rule out serious spinal lesions.