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I have had bilateral lower costal margin (lower rib margin) pain, flank pain for about 8 years .
Pain pattern
Pain starts within 1 second of sitting.
Standing reduces the pain by about 90% within 10 seconds.
Walking causes only 2–5% pain.
Before getting out of bed in the morning, I have no pain.
Lying down causes about 20% pain.
The pain is spread across both lower rib margins, not one small point.
The sensation is mainly pressure/tightness, not burning or stabbing.
The pain is NOT affected by
Deep breathing
Coughing
Sneezing
Meals
Leaning forward
Hard vs. soft chair
Pressing on the painful area
Tests reported as normal
CBC
ESR
CRP
Vitamin D
Vitamin B12
Urine tests
Chest X-ray
Abdominal ultrasound
Thoracic (dorsal) spine MRI
Upper GI endoscopy
Musculoskeletal ultrasound of the anterior abdominal wall
Chest wall MRI has been performed, and the report is expected today.
Treatments tried..."I have just received my chest MRI report today."