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my lower back always hurts and is very tight

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Educational information only — always confirm with a licensed provider.
Short answer

Chronic lower back pain and tightness are typically caused by mechanical dysfunction in the lumbar spine, often resulting from prolonged sitting, poor lifting mechanics, or muscle imbalances. While most acute episodes resolve within a few weeks, persistent tightness often indicates that the body is using muscle tension as a "splint" to protect stiff or misaligned spinal joints.

Short answer

Chronic lower back pain and tightness are typically caused by mechanical dysfunction in the lumbar spine, often resulting from prolonged sitting, poor lifting mechanics, or muscle imbalances. While most acute episodes resolve within a few weeks, persistent tightness often indicates that the body is using muscle tension as a "splint" to protect stiff or misaligned spinal joints.

Most likely causes

  • Postural Stress: Prolonged sitting causes the hip flexors to shorten and the glutes to become inactive, placing excessive strain on the lumbar vertebrae.
  • Facet Joint Dysfunction: The small joints that connect your vertebrae can become restricted or inflamed, leading to a sensation of "locking" or deep aching.
  • Muscular Strains: Overuse or sudden movements can cause micro-tears in the erector spinae muscles, leading to protective spasms.
  • Degenerative Changes: Age-related wear on the intervertebral discs can reduce the space between vertebrae, causing the surrounding ligaments and muscles to tighten in response.
  • Lumbar Instability: Weakness in the deep core muscles (like the multifidus) forces the larger surface muscles to work overtime, resulting in chronic fatigue and tightness.
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