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myofascialpain.com
Atlas · Mid Back

Iliocostalis Thoracis

Lateral thoracic aching from iliocostalis trigger points along rib angle attachment sites

Body region
Mid Back
Trigger points
2
documented in this muscle
Common symptoms
8
patterns cataloged
Common causes
9
contributory factors

Trigger points

TrP 1

TrP1

Location. Outer thoracic spine

Pain referral. Outer back, rib area

  • Outer back
  • Rib area
  • Lateral trunk
TrP 2

TrP2

Location. Lower rib attachment near 10th-12th ribs

Pain referral. Lateral lower thoracic and flank region

  • Lateral lower thoracic wall
  • Flank region
  • Lower posterior ribs
  • Upper lateral abdomen (referred)
  • Lateral thoracolumbar area

Symptoms patients report

Side back pain. Lateral thoracic aching from iliocostalis trigger points along rib angle attachment sites

Rib discomfort. Pain along posterior rib cage from trigger point referral near costal angle insertions

Trunk pain. Lateral trunk wall pain from iliocostalis thoracis trigger point widespread referral zone

Lateral lower thoracic ache. Dull aching at lateral lower thoracic wall from iliocostalis trigger points at lower rib attachments

Flank pain. Lateral flank ache from iliocostalis referral mimicking renal or visceral pathology patterns

Pain with lateral bending. Side-bending stretches or contracts iliocostalis trigger points aggravating lateral thoracic pain

Lower rib cage tenderness. Palpable tenderness along lower posterior ribs from iliocostalis attachment trigger points

Difficulty with deep side breathing. Impaired lateral rib expansion from iliocostalis taut bands restricting lower rib cage excursion

Common causes

Poor posture. Chronic thoracic malalignment overloads lateral erector spinae maintaining spinal upright position

Lifting. Heavy or repetitive lifting creates excessive loading on lateral thoracic paraspinal muscles

Twisting. Repetitive trunk rotation creates shearing forces across lateral erector spinae muscle fibers

Weak core. Core insufficiency forces compensatory iliocostalis thoracis overactivation for trunk stabilization

Unilateral carrying habits. Asymmetric load carrying overworks ipsilateral iliocostalis to maintain trunk alignment against lateral forces

Side-bending activities. Repetitive lateral trunk flexion overloads iliocostalis as a primary lateral flexor muscle

Scoliosis compensation. Spinal curvature creates sustained asymmetric iliocostalis loading on the concave side chronically

Coughing (one-sided). Asymmetric coughing forces create unilateral iliocostalis overload at lower rib attachments

Sleeping on one side chronically. Habitual side-lying posture shortens dependent iliocostalis promoting trigger point formation

Treatment & self-care

immediate

Foam roller along thoracic paraspinals

Lie on your back with a foam roller placed horizontally beneath your mid-back, just to the side of your spine on the painful side. Keep your knees bent and feet flat on the floor. Slowly roll up and down along the muscles between your spine and shoulder blade, pausing on any tender spots for 30-60 seconds until the tenderness begins to release. Avoid rolling directly on the spine itself.

Duration
5-10 minutes per session
Frequency
1-2 times per day
Expect
Reduced tightness and aching along the lateral thoracic paraspinals within several days of consistent use
exercise

Side-lying thoracic rotation stretch

Lie on your side with both knees bent to about 90 degrees and arms extended in front of you. Slowly open your top arm, rotating your upper body toward the ceiling while keeping your knees stacked together. Follow your hand with your eyes. Hold the open position for 15-20 seconds, breathing deeply. Return to the starting position. Repeat 8-10 times on the affected side.

Duration
5 minutes per session
Frequency
2-3 times per day
Expect
Improved thoracic rotation and reduced lateral back stiffness within 1-2 weeks
exercise

Cat-cow thoracic mobilization

Start on your hands and knees with wrists under shoulders and knees under hips. Inhale as you drop your belly toward the floor, lifting your chest and tailbone (cow). Exhale as you round your back toward the ceiling, tucking your chin and tailbone (cat). Move slowly and focus on articulating each segment of the thoracic spine. Perform 15-20 repetitions.

Duration
3-5 minutes per session
Frequency
2-3 times per day
Expect
Improved thoracic mobility and reduced paraspinal muscle tension within 1-2 weeks
exercise

Seated extension over chair back

Sit in a sturdy chair and interlace your hands behind your head. Place a rolled towel at the back of the chair at mid-back level for a fulcrum. Gently lean back over the towel, extending your thoracic spine. Hold for 5 seconds at end range, then return to upright. Perform 10-15 repetitions. Keep your lower back relatively stable and focus the movement in your mid-back.

Duration
3-5 minutes per session
Frequency
3-4 times per day, especially during desk work
Expect
Reduced mid-back stiffness and improved extension mobility within 1-2 weeks
lifestyle

Workstation posture optimization with lumbar support

Adjust your chair so your feet are flat on the floor and your hips are level with or slightly above your knees. Place a lumbar support roll or small pillow in the curve of your lower back. Position your monitor at eye level and at arm's length. Keep your shoulders relaxed and elbows at about 90 degrees. Take a 30-second standing break every 30 minutes to reset your spinal posture.

Duration
Throughout the workday
Frequency
Daily, with breaks every 30 minutes
Expect
Reduced postural strain on thoracic paraspinals and fewer pain flare-ups within 2-3 weeks
professional

Professional evaluation for persistent lateral back pain

If lateral thoracic pain persists beyond 3-4 weeks despite self-care, consult a healthcare professional. A physiotherapist can perform specific assessment of rib mobility, thoracic spine segmental motion, and paraspinal muscle condition. Treatment may include manual therapy, dry needling of the iliocostalis trigger points, and a tailored exercise program.

Duration
Initial evaluation: 45-60 minutes
Frequency
As needed based on symptom progression
Expect
Accurate diagnosis distinguishing muscular pain from rib or pulmonary pathology and a targeted treatment plan
Key Takeaways
  1. Lateral thoracic aching from iliocostalis trigger points along rib angle attachment sites
  2. Pain along posterior rib cage from trigger point referral near costal angle insertions
  3. Lateral trunk wall pain from iliocostalis thoracis trigger point widespread referral zone
  4. Dull aching at lateral lower thoracic wall from iliocostalis trigger points at lower rib attachments
  5. Lateral flank ache from iliocostalis referral mimicking renal or visceral pathology patterns