Middle back pain affects the thoracic spine, the stretch of vertebrae between the base of your neck and the bottom of your rib cage. It’s common across all age groups, with studies estimating that 15% to 35% of adults experience thoracic spine pain at some point. Most cases trace back to muscular strain or poor posture, but the middle back is also a region where pain from internal organs can show up in surprising ways.
Muscle Strain and Soft Tissue Injury
The most frequent cause of middle back pain is strain to the muscles and ligaments that support your thoracic spine. This area relies on layers of muscle to stabilize your rib cage and shoulder blades during everyday movement. Overuse, awkward lifting, sudden twisting, or even sleeping in an unusual position can stretch or tear these soft tissues. The pain typically feels like a dull ache or tightness between the shoulder blades, and it often worsens when you move, reach overhead, or take a deep breath.
In many cases, muscle-related middle back pain improves on its own with rest. If it hasn’t gotten better after about a week, that’s a reasonable point to seek professional evaluation.
Poor Posture and Prolonged Sitting
Hours spent hunched over a desk, phone, or steering wheel place sustained stress on the thoracic spine. When you slouch, the ligaments and muscles holding your vertebrae in place get stretched beyond their comfortable range. Over time, this pulls your spine into a more rounded shape, a condition called postural kyphosis. It’s the most common type of abnormal thoracic curvature and often develops during the teenage years, though adults who sit for long periods are just as vulnerable.
The fix is less about one magic exercise and more about how you move through your day. Being aware of how you sit, stand, and carry things makes a real difference. Something as simple as switching from a heavy backpack to a rolling bag, or adjusting your monitor height so you’re not looking down for hours, reduces the mechanical load on your mid-back. The pain from postural kyphosis is generally reversible with consistent habit changes, unlike structural forms of kyphosis that involve changes to the bones themselves.
Disc Herniation in the Thoracic Spine
A herniated disc happens when the cushion between two vertebrae bulges or ruptures, pressing on nearby nerves. You hear about this most often in the lower back or neck, and for good reason: thoracic disc herniations account for less than 1% of all disc herniations. The thoracic spine is more rigid than other segments because it’s anchored to the rib cage, which limits its range of motion and protects the discs.
When a thoracic disc does herniate, the symptoms can be confusing. You might feel pain in your upper back that wraps around your chest, numbness or tingling along your ribs, or even leg weakness if the disc presses on the spinal cord. Some people initially mistake it for chest pain from a heart or lung problem. Because it’s so rare, thoracic disc herniation is often diagnosed only after more common causes have been ruled out.
Compression Fractures
Vertebral compression fractures are a major source of middle back pain, particularly in older adults. Over 750,000 new osteoporotic compression fractures occur each year in the United States, and more than a third of them become chronically painful. Among people aged 50 to 79, the prevalence of these fractures ranges from 12% to 40%.
Osteoporosis weakens bone to the point where a vertebra can crack under forces that would normally be harmless, like bending forward to pick something up or even coughing hard. The thoracic spine is a common site for these fractures. The pain usually comes on suddenly, feels sharp and localized to one spot, and gets worse when you stand or walk. Younger adults can also fracture thoracic vertebrae, but this typically requires significant trauma like a car accident or a fall from height. The age distribution for traumatic fractures peaks in two groups: people aged 15 to 29 and those over 65.
Scheuermann’s Disease
This condition is a structural cause of middle back pain that develops during adolescence, most commonly diagnosed between ages 12 and 17. Parents often notice it first as a “hunchbacked” appearance that doesn’t correct when the teenager stands up straight. Unlike postural kyphosis, which involves flexible rounding of the spine, Scheuermann’s disease involves rigid curvature caused by wedge-shaped vertebrae. The diagnostic criteria require at least three adjacent vertebrae to each be wedged by 5 degrees or more.
The pain tends to worsen with activity and prolonged sitting. Because the curvature is structural, it doesn’t resolve with posture correction alone, though physical therapy and bracing during growth years can help manage it.
Pain Referred From Internal Organs
One of the trickier aspects of middle back pain is that it doesn’t always originate in the back. Several organs share nerve pathways with the thoracic spine, so problems inside the body can produce pain that feels like it’s coming from your mid-back.
- Gallbladder: Gallstones commonly cause pain between the shoulder blades, often after eating fatty meals.
- Pancreas: Pancreatitis can produce upper back pain alongside severe abdominal discomfort.
- Kidneys: Kidney stones or infections typically cause pain in the lower-to-mid back on one side, often with urinary symptoms.
- Spleen: A ruptured spleen can cause pain between the shoulder blades, sometimes without obvious abdominal symptoms at first.
- Heart: Heart conditions, including heart attacks, can cause upper back or shoulder pain, especially when accompanied by trouble breathing, dizziness, or chest pressure.
The distinguishing feature of referred pain is that it usually comes with other symptoms unrelated to movement. If your back pain doesn’t change when you shift positions but gets worse after eating, comes with fever, or shows up alongside breathing difficulty, the source may not be your spine at all.
Warning Signs That Need Prompt Attention
Most middle back pain is benign and self-limiting, but certain patterns suggest something more serious. Unexplained weight loss, night sweats, or a history of cancer raise concern for spinal tumors or metastatic disease. Fever combined with worsening back pain can indicate a spinal infection, particularly in people with diabetes, weakened immune systems, or a recent spinal procedure.
Neurological symptoms are the most urgent red flags. Progressive weakness in both legs, loss of bladder or bowel control, or numbness in the groin area can signal spinal cord compression, which requires emergency evaluation. Back pain following significant trauma, like a fall or car accident, warrants imaging to rule out fractures, especially if pressing on the spine reproduces sharp, localized pain.
In rare cases, middle back pain is the presenting symptom of a ruptured abdominal aortic aneurysm, which can cause back or flank pain along with lightheadedness or fainting. This is most relevant for people with a history of high blood pressure or vascular disease.
How Middle Back Pain Is Evaluated
A physical examination for middle back pain follows a systematic approach. Your provider will observe your posture and look for visible asymmetry, abnormal curvature (lordosis, kyphosis, scoliosis), or muscle wasting. They’ll press along your spine to check for point tenderness, which can help distinguish a fracture or bone lesion from a muscle problem. Step-offs, where one vertebra feels like it’s shifted forward relative to its neighbor, suggest a structural issue.
Range of motion testing measures how well your thoracic spine bends and rotates. Normal thoracic flexion is about 80 degrees from a neutral standing position, with extension around 30 degrees. If movement is significantly restricted or painful in a specific direction, that narrows the list of possible causes. A neurological exam of the lower extremities, checking strength, sensation, and reflexes, helps determine whether the spinal cord or nerve roots are involved.
Imaging isn’t always necessary for straightforward muscle strain, but X-rays, MRI, or CT scans may be ordered when pain persists, when there’s a history of trauma, or when neurological symptoms are present.