Upper back pain most often comes from strained muscles, poor posture, or stiff joints in the thoracic spine, the 12 vertebrae between your neck and lower back. About 30% of working adults experience thoracic spine pain in any given year, though it gets far less attention than neck or lower back problems. The causes range from everyday muscle overuse to, in rare cases, signals from internal organs.
Muscle Strain and Overload
The most common reason your upper back hurts is that the muscles there have been pushed beyond what they can handle. Several muscle groups work together to stabilize your rib cage, control your posture, and allow you to twist, reach, and breathe. When external force exceeds what those muscles can absorb, fibers get damaged and inflamed.
This can happen suddenly, like when you lift something heavy, twist awkwardly, or catch a shifting load you weren’t expecting. But it can also build gradually. Repetitive tasks fatigue the tissue over time, especially if your upper back muscles are deconditioned or your thoracic spine lacks normal mobility. Many strains come from a combination of poor load management, insufficient muscular endurance, and movement habits that concentrate stress on one area.
Muscles that run along either side of the spine (the erector spinae and deeper stabilizers) control how much your spine flexes and rotates. The intercostal muscles between your ribs support rib motion during breathing and reaching. When any of these groups are overworked or under-conditioned, pain follows.
Posture and Prolonged Positioning
Sitting hunched over a desk, phone, or steering wheel for hours loads the upper back in ways it wasn’t designed to sustain. Your head drifts forward, your shoulders round, and the muscles between your shoulder blades have to work constantly to keep you from folding further. Over weeks and months, this creates chronic tightness, trigger points, and aching that tends to worsen as the day goes on.
The thoracic spine is naturally curved slightly forward (a kyphosis), but sustained slouching exaggerates that curve and compresses the front edges of the discs. The muscles and ligaments on the back side get stretched and strained. It’s one of the most common patterns in office workers, students, and anyone who spends long periods looking down.
Facet Joint Dysfunction
Each vertebra connects to the one above and below it through small paired joints called facet joints. When these joints become irritated, whether from arthritis, injury, or repetitive stress, they produce a dull, hard-to-pinpoint ache in the upper back. The pain doesn’t follow a clear nerve path. Instead, your brain struggles to localize it, so it feels spread across a vague region rather than one specific spot.
Facet joint pain typically worsens with sudden movements or prolonged awkward positions: kneeling in the garden, bending over to lift, or hunching over a computer. Many people notice it’s worst at night, when the muscles fully relax and the joint surfaces press together without muscular support. The surrounding muscles often spasm in response, which can make the pain feel more widespread and confusing to diagnose. Imaging and sometimes a diagnostic injection into the joint are used to confirm it.
Disc Degeneration and Bone Spurs
The discs between your thoracic vertebrae lose water content and height as you age, a process called degenerative disc disease. As discs thin, the vertebrae shift closer together, and your body responds by growing extra bone tissue at the edges, known as bone spurs. These spurs are part of the body’s repair process, essentially its attempt to stabilize a segment that’s lost cushioning.
Bone spurs often cause no symptoms at all. But when they grow near the openings where nerves exit the spinal column, they can compress those nerves and produce pain, tingling, numbness, or weakness. In rare cases, spurs grow inward and press on the spinal cord itself. Degenerative changes in the thoracic spine are extremely common on imaging in people over 50, though many of those people have no pain, which is why imaging findings alone don’t always explain what you’re feeling.
Scheuermann’s Disease
This condition typically appears between ages 10 and 12, though a small subset of people develop it as adults. In Scheuermann’s disease, several vertebrae in a row become wedge-shaped, with the front edge shorter than the back. The diagnostic threshold is anterior wedging of more than 5 degrees across three consecutive vertebrae, which creates an exaggerated forward curve in the upper back.
Mild cases may cause only a visible rounding of the upper back and occasional stiffness. More pronounced curves (above 60 degrees) can produce persistent pain and may benefit from bracing in adolescents who are still growing. Surgery is generally reserved for curves exceeding 75 degrees. If you developed a noticeably rounded upper back as a teenager and still deal with stiffness or aching in that area, Scheuermann’s could be the underlying reason.
Referred Pain From Internal Organs
Not all upper back pain starts in the back. Several organs share nerve pathways with the thoracic spine, so problems in those organs can produce pain you feel between or around your shoulder blades. This is called referred pain, and it’s worth knowing about because the cause requires very different treatment.
- Gallbladder problems: Gallstones and gallbladder inflammation (cholecystitis) commonly cause pain in the right upper back and shoulder blade area, often appearing one to two hours after a fatty meal and accompanied by nausea or vomiting.
- Pancreatitis: Inflammation of the pancreas can send pain straight through to the upper back.
- Heart conditions: Cardiac ischemia, including heart attacks, can present as upper back or chest pain, sometimes with nausea. People with risk factors for heart disease should take new, unexplained upper back pain seriously.
- Kidney infections and stones: These typically cause flank pain that wraps toward the back, often with fever, nausea, or a history of urinary tract infections.
- Peptic ulcers: A boring pain from the stomach area through to the middle back, often related to meals, can signal an ulcer, particularly in people who use anti-inflammatory medications frequently.
- Spleen rupture: Pain between the shoulder blades (known as Kehr’s sign) can indicate a ruptured spleen, which is a medical emergency.
When Upper Back Pain Is a Warning Sign
Most upper back pain is muscular and resolves with time, movement, and improved habits. But thoracic spine pain carries a slightly higher index of suspicion for serious pathology compared to common lower back pain. Red flags that warrant prompt medical evaluation include:
- Constant, severe pain that doesn’t improve with rest or position changes and progresses over days
- Unexplained weight loss, fever, or chills alongside back pain
- History of cancer with new thoracic pain, especially in people over 50
- Recent significant trauma like a car accident or fall, or even minor strain in someone with osteoporosis
- Neurological symptoms such as progressive weakness, numbness, or loss of bladder or bowel control
- Pain that hasn’t changed despite two to four weeks of treatment
- Severe morning stiffness lasting more than 30 minutes, which can suggest inflammatory conditions like ankylosing spondylitis
New back pain appearing for the first time before age 20 or after age 50 also deserves closer evaluation, as the likelihood of a structural or systemic cause is higher in those age groups.
What Helps Upper Back Pain
For the majority of cases rooted in muscle strain, posture, or joint stiffness, restoring mobility and building endurance in the thoracic spine muscles makes the biggest difference. Lying back over a foam roller or stability ball to extend the thoracic spine has been shown to improve rounded-shoulder posture and reduce associated neck pain. It’s a simple starting point, though it’s a passive stretch rather than a functional movement.
More active exercises tend to produce better long-term results. The Y-lift (or Superman variation), where you lie face down and raise your arms overhead in a Y shape, has some of the stronger evidence for building work capacity in the thoracic spine. An eight-week program that included this exercise improved both forward head posture and rounded shoulders in competitive swimmers. Functional movements like the Jefferson curl and seated rotation exercises train the spine through ranges of motion it actually uses in daily life.
Breaking up prolonged sitting matters too. The upper back stiffens quickly in a flexed position, and even brief movement breaks, standing, reaching overhead, gently rotating, can interrupt the cycle of compression and muscle fatigue. Strengthening the muscles between your shoulder blades (through rows, band pull-aparts, or similar exercises) helps counteract the forward-pulling forces of desk work and phone use. Research on thoracic spine exercise is still limited overall, but the combination of mobility work, postural strengthening, and regular movement breaks is the most practical approach available.