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The Physical Therapy Clinic

Low back pain causes

24 February 2026

Written by , BSc Hons, MSCP · Physiotherapist, Co-owner

1. Muscle or ligament strain (most common)

What happens: Overstretching or overloading the muscles supporting your spine.

Common triggers:

  • Lifting with poor form
  • Sudden return to exercise
  • Twisting while lifting
  • Sitting too long, then intense activity

Feels like:

  • Dull ache
  • Tightness
  • Worse with movement
  • Better with rest

2. Herniated or bulging disc

What happens: The cushion between vertebrae pushes outward and irritates nerves.

Feels like:

  • Sharp or shooting pain
  • Pain down one leg (sciatica)
  • Numbness or tingling
  • Worse when sitting

3. Joint problems (facet joint irritation)

What happens: Small joints in the spine become irritated or arthritic.

Feels like:

  • Pain when leaning backward
  • Stiffness in the morning
  • Localised pain (not usually down the leg)

4. Poor core strength / deconditioning

If you've taken time off exercise, this is very common.

When core muscles are weak:

  • Lower back muscles overwork
  • Posture worsens
  • Small loads feel heavy

This often causes:

  • Achy pain after activity
  • Fatigue in the lower back
  • Relief when lying down

5. Less common but serious causes

See a doctor urgently if you have:

  • Loss of bowel or bladder control
  • Severe leg weakness
  • Fever with back pain
  • Pain after major trauma

These could indicate nerve compression or infection.

If you'd like your back pain properly assessed, call us on 01604 630636.