Upper back pain is most often caused by muscle tension, poor posture, or stress, though it can sometimes signal a problem with the spine or an internal organ. Roughly 1 in 10 men and 1 in 5 women experience thoracic spine pain in any given week, making it less common than low back or neck pain but far from rare.
Muscle Strain and Overuse
The trapezius muscles, two large muscles that span either side of your upper back and extend up into your neck, are the most common source of upper back pain. Overuse, injury, and nerve irritation are the top causes of trapezius pain. Sports injuries and repetitive motions, like reaching overhead or rowing, can strain these muscles, as can sudden awkward movements like catching yourself during a fall.
The rhomboid muscles, which sit between your shoulder blades and help pull them together, are another frequent culprit. They tend to flare up from activities that involve repeated pulling or throwing. Because both muscle groups work together to stabilize your shoulders and upper spine, a problem in one often creates compensatory strain in the other.
Posture and Desk Work
Sitting hunched over a screen for hours is one of the most common reasons people develop persistent upper back pain. When your head drifts forward, even slightly, the muscles in your upper back and neck have to work much harder to support it. Research on spinal movement shows that about 30% of the total motion during forward head posture occurs in the junction between the lower neck and upper back, meaning those muscles and joints absorb a disproportionate share of the load.
Over time, this forward-leaning position shortens the chest muscles and overstretches the upper back muscles, creating a cycle of tightness and weakness. If you spend most of your day at a computer, a few adjustments can reduce the strain considerably. The Mayo Clinic recommends placing your monitor directly in front of you at arm’s length (roughly 20 to 40 inches from your face), with the top of the screen at or just below eye level. Your feet should rest flat on the floor, and your thighs should be parallel to it. If you wear bifocals, lower the monitor an extra inch or two for comfortable viewing without tilting your head back.
Stress and Emotional Tension
Stress doesn’t just feel like it lives in your shoulders. It physically does. When you’re under stress, your body releases adrenaline as part of the fight-or-flight response, which increases blood pressure and causes the muscles around your spine to tense and spasm. Your shoulders hunch up, and pain builds throughout the upper and middle back. Many people hold this tension unconsciously, clenching their trapezius muscles for hours without realizing it.
Because stress-related tension tends to be constant and low-grade rather than sudden, it often goes unrecognized as the source of pain. People assume they injured something when, in reality, their muscles have been locked in a partial contraction all day. Neck tension from stress can also trigger headaches, which further tightens the cycle of pain and muscle guarding.
Spinal Disc and Joint Problems
Disc herniations in the upper back (thoracic spine) are far less common than in the lower back or neck. Imaging studies find thoracic disc herniations in about 11 to 37% of people scanned, but most of these cause no symptoms at all. Symptomatic thoracic disc herniation, the kind that actually produces pain or nerve compression, is estimated to occur in as few as 1 in 1,000 people.
A thickened ligament along the back of the spinal canal is another structural finding in the thoracic spine, appearing in about 19% of people who undergo imaging for back or leg pain. Like disc bulges, this is often an incidental finding that doesn’t explain someone’s symptoms. When a thoracic disc or joint problem does cause pain, it typically produces a band-like ache across the back or along the ribs, sometimes with numbness or tingling that wraps around the torso.
Referred Pain From Internal Organs
Sometimes upper back pain has nothing to do with the back itself. Your brain can misinterpret signals traveling along shared nerve pathways, causing you to feel pain in your back when the real problem is in an organ. Several organs can produce this type of referred pain:
- Esophagus: A spasm or irritation can create a twisting pain right between the shoulder blades.
- Heart: Angina, or reduced blood flow to the heart, can feel like aching or pressure in the upper back.
- Kidneys: Infections or kidney stones frequently present as back pain, often on one side.
- Lungs: Conditions like pleurisy (inflammation of the lining around the lungs) cause back pain that worsens with breathing. In rare cases, back pain can be an early sign of lung cancer.
- Spleen: A sudden, sharp pain between the shoulder blades can signal a ruptured spleen, which is a medical emergency.
Referred pain from organs typically behaves differently from musculoskeletal pain. It doesn’t change with movement or posture, and it often comes with other symptoms like nausea, shortness of breath, or fever.
Inflammatory Conditions
Ankylosing spondylitis is a chronic inflammatory condition that primarily affects the spine and can cause stiffness and pain in the upper back. The pattern of pain is distinctive: it doesn’t improve with rest, often wakes you up at night, and tends to feel better with movement and exercise rather than worse. It usually starts in the lower back and sacroiliac joints before gradually moving upward.
Most people with ankylosing spondylitis carry a specific gene variant called HLA-B27, though having the gene doesn’t guarantee you’ll develop the condition. Diagnosis typically involves imaging (X-ray or MRI) to look for inflammation in the sacroiliac joints, combined with a history of at least three months of back pain that improves with activity. Limited chest expansion compared to what’s expected for your age is another clinical sign, since inflammation can stiffen the joints where the ribs meet the spine.
Warning Signs That Need Urgent Attention
Most upper back pain is muscular and resolves on its own, but certain patterns suggest something more serious. Clinicians look for specific red flags, including pain that doesn’t respond to over-the-counter pain relievers, unexplained weight loss or night sweats, a recent history of trauma or spinal procedures, and fever alongside back pain (though fever is only present in about half of patients with spinal infections).
The most urgent warning signs involve nerve compression in the spinal cord. Bowel or bladder problems that are new, difficulty with sexual function, numbness in the groin or inner thighs (sometimes called saddle numbness), and progressive weakness in both legs all suggest the spinal cord may be under pressure. These symptoms, combined with upper back pain, call for immediate evaluation. Similarly, upper back pain accompanied by chest pain, trouble breathing, or symptoms that could indicate a heart attack or blood clot in the lungs is an emergency.