Upper back pain most often comes from muscle strain, poor posture, or overuse of the muscles between your shoulder blades and along your spine. But the list of possible causes is long, ranging from simple tension knots to spinal arthritis to pain referred from internal organs. Understanding where your pain fits can help you figure out whether it needs rest, a posture fix, or a trip to urgent care.
Muscle Strain and Trigger Points
The muscles most commonly involved in upper back pain are the trapezius (the large diamond-shaped muscle spanning your neck, shoulders, and mid-back) and the rhomboids (the smaller muscles connecting your shoulder blades to your spine). These muscles do constant low-level work holding your head and shoulders in position, which makes them vulnerable to overuse, especially with poor form during exercise or repetitive movements at work.
When a muscle is overworked or injured, tight knots called trigger points can form within the muscle fibers. These spots are tender when pressed, but they also produce “referred pain,” meaning you feel the ache somewhere other than the knot itself. A trigger point in the trapezius, for example, can send pain up into your neck and head or down between your shoulder blades. Stress and anxiety make trigger points more likely because people under chronic stress tend to clench their muscles without realizing it, creating the same kind of repeated strain that a physical task would.
Posture and Screen Time
Spending hours looking down at a phone or leaning toward a computer screen shifts your head forward, increasing the load on your upper back muscles. Over time, this forward head posture can flatten the natural curve of your upper spine and reduce your range of motion in the neck and upper back. The muscles along the back of your spine have to work harder to compensate, which can lead to fatigue, stiffness, and pain that builds gradually over weeks or months.
Workstation setup plays a big role. If your monitor is too low, too far away, or off to one side, your head and shoulders drift out of alignment for hours at a time. Positioning your screen directly in front of you, about an arm’s length away, with the top of the screen at or slightly below eye level can reduce the strain. Your chair should support your spine so your feet rest flat on the floor, your thighs are parallel to the ground, and your shoulders stay relaxed rather than hiked up toward your ears. These adjustments sound minor, but they change the mechanical load on your upper back significantly over the course of a workday.
Spinal Arthritis and Joint Wear
Osteoarthritis can affect the small facet joints that connect your vertebrae, and the thoracic spine (the twelve vertebrae of your upper and mid-back) is no exception. As the cartilage in these joints wears down, the bones can develop overgrowths called bone spurs. The joints themselves can enlarge in a process called facet joint hypertrophy. None of this happens overnight. It develops over years and is more common after age 50.
Worn-down discs between your vertebrae can accelerate the process. As discs lose height and thin out, more pressure transfers to the facet joints, creating a cycle of increased friction and cartilage damage. When bone spurs grow large enough to narrow the passages where your spinal cord and nerves travel, they can cause spinal stenosis, which adds nerve-related symptoms like tingling, numbness, or weakness to the existing stiffness and ache.
Thoracic Disc Herniation
A herniated disc in the upper back is uncommon. Thoracic disc herniations account for less than 1 percent of all disc herniations, with the vast majority occurring in the lower back or neck instead. The thoracic spine is more rigid than other parts of the spine because the ribs attach to it, which limits movement and protects the discs from the wear that affects more mobile segments.
When a thoracic disc does herniate, symptoms can include localized upper back pain, numbness or tingling that wraps around the chest, leg weakness, and occasionally chest pain. The chest-wrapping pattern is distinctive and can sometimes be mistaken for a heart or lung problem.
Compression Fractures
Compression fractures happen when a vertebra partially collapses under load. They occur most often in the thoracic spine, and the typical patient profile is a woman over 50 with weakened bones from osteoporosis, though they can happen to anyone with reduced bone density. By age 80, an estimated 40 to 50 percent of people have experienced at least one compression fracture.
The hallmark symptom is sudden back pain that worsens with movement and improves with rest. You might also notice tenderness at one specific spot on your spine, muscle spasms, difficulty bending or twisting, and tingling if the fracture pinches a nerve. A loss of height over time is a common sign, sometimes the first clue that a fracture has occurred. Some compression fractures happen without a clear injury, especially when bone density is very low, making them easy to overlook or attribute to “just getting older.”
Referred Pain From Internal Organs
Not all upper back pain starts in the back. Your brain can misinterpret pain signals from internal organs as coming from your back when those organs share the same nerve pathways as the muscles and skin of the thoracic region. This is called referred pain, and it has some distinguishing features: it typically comes on without any injury or physical strain you can point to, and it may appear suddenly or build gradually.
Gallbladder problems are one of the more common culprits. Pain from gallstones or inflammation often radiates to the right upper back and right shoulder blade. Peptic ulcers can refer pain to the mid-upper back. Lung conditions, including infections like pneumonia, can cause upper back pain on the affected side. Kidney stones or infections sometimes produce pain that wraps from the flank to the back.
The most urgent forms of referred upper back pain involve the heart and lungs. Pain between your shoulder blades can be a symptom of a heart attack, particularly in women, who are more likely to experience “atypical” heart attack symptoms that don’t center on chest pressure. A pulmonary embolism (a blood clot in the lungs) can also cause sudden upper back pain. If your upper back pain comes with trouble breathing, chest pain, dizziness, or a sense that something is seriously wrong, treat it as an emergency.
Stress and Muscle Tension
Chronic stress produces physical tension in the muscles of the upper back, neck, and shoulders, often without you noticing until the pain becomes persistent. People under sustained psychological stress tend to hold their shoulders in a slightly elevated, tightened position. Over weeks and months, this low-grade clenching creates the same kind of muscle fatigue and trigger points that repetitive physical tasks do. The pain is real and muscular in origin, even though the root cause is emotional. It typically presents as a dull, persistent ache across the upper back and between the shoulder blades, sometimes accompanied by tension headaches.
Less Common but Notable Causes
Several other conditions can produce upper back pain, though they’re far less frequent than muscle strain or postural issues:
- Scoliosis: An abnormal sideways curve in the spine can create uneven loading on thoracic muscles and joints, leading to pain that tends to worsen with prolonged standing or sitting.
- Shingles: Before the characteristic rash appears, shingles can cause burning or shooting pain along a band of skin on one side of the upper back, often mistaken for a muscle problem.
- Spinal tumors: Rarely, a growth on or near the spine can cause progressive upper back pain that doesn’t improve with rest and may worsen at night.
The pattern of your pain offers useful clues. Pain that tracks clearly to a new exercise routine, a long day hunched over a desk, or a stressful period at work is most likely muscular. Pain that appears without a clear physical cause, gets worse rather than better over days, wakes you at night, or comes with breathing difficulty, chest pressure, unexplained weight loss, or neurological symptoms like numbness in your legs points to something that needs prompt evaluation.