Middle back pain originates in the thoracic spine, the twelve vertebrae that run from the base of your neck to the bottom of your rib cage. This region is more stable than your lower back or neck because the ribs attach to it, limiting how much it can bend and twist. That stability means serious structural problems like herniated discs are far less common here, but it also means the mid-back is vulnerable to a different set of issues, from muscle strain and poor posture to referred pain from internal organs.
Muscle Strain and Postural Stress
The most common reason for middle back pain is strain in the muscles and soft tissues that support the thoracic spine. The rhomboids, which sit between your shoulder blades and pull them toward your spine, and the middle and lower trapezius, which stabilize the shoulder blades during arm movement, are frequent culprits. When these muscles are overworked, overstretched, or held in a shortened position for hours at a time, they develop painful trigger points and inflammation.
Prolonged sitting is the single biggest postural trigger. When you hunch over a keyboard or phone, your shoulders roll forward, your upper back rounds, and the muscles between your shoulder blades stretch beyond their resting length. Hold that position for eight hours a day, five days a week, and those tissues accumulate microtrauma faster than they can repair. This applies to both desk workers and people in physical jobs. Repetitive motions like lifting, reaching overhead, or twisting can create strain injuries that settle squarely in the mid-back.
Sports and hobbies play a role too. Rowing, swimming, golf, and even gardening load the thoracic muscles in repetitive patterns. The pain typically feels like a dull ache between the shoulder blades that worsens with activity or sitting and improves with movement or stretching.
Compression Fractures
Compression fractures happen when a vertebra collapses under pressure, and the thoracic spine is the most common location for them. Osteoporosis is the leading cause. As bone density drops, vertebrae can fracture from something as minor as a cough, a sneeze, or bending to pick something up. Some people don’t even recall a specific event that caused the fracture.
The risk is highest for women who have gone through menopause, adults over 50, and anyone with a condition that weakens bone. Studies estimate that 40% to 50% of people aged 80 or older have experienced at least one compression fracture. Having one fracture significantly raises the odds of having another. The pain usually comes on suddenly, feels sharp and localized to a specific spot in the mid-back, and worsens when you stand or walk.
Disc and Joint Degeneration
Herniated discs in the thoracic spine are rare, accounting for only about 1% of all disc herniations. The thoracic spine’s limited range of motion and shorter disc heights protect it. As thoracic discs age, they tend to dry out and stiffen rather than bulge or rupture the way lumbar discs often do. When a thoracic herniation does occur, it can press on nearby nerves or even the spinal cord, causing pain that wraps around the rib cage or radiates into the chest.
Osteoarthritis is more relevant in this region. The joints connecting each vertebra to the one above and below it, along with the joints where the ribs meet the spine, can develop cartilage loss and bone spurs over time. This produces stiffness and a deep ache that tends to be worst in the morning or after sitting still for a while. The degeneration is gradual, and many people have some degree of it on imaging without any symptoms at all.
Scheuermann’s Disease
Scheuermann’s disease is a developmental condition that causes an exaggerated forward curve in the upper or middle back. It develops during adolescence, when the front edges of three or more consecutive vertebrae grow more slowly than the back edges, creating a wedge shape. The result is a rigid, rounded upper back that doesn’t straighten when you try to stand tall.
The condition is diagnosed when imaging shows at least three adjacent vertebrae each wedged by 5 degrees or more, with an overall forward curve exceeding 40 degrees. Many people with Scheuermann’s disease experience only mild stiffness during their teen years, but the altered spinal mechanics can lead to chronic mid-back pain in adulthood, especially after long periods of sitting or physical activity.
Referred Pain From Internal Organs
Not all middle back pain starts in the back. Several internal organs share nerve pathways with the thoracic spine, which means a problem inside your body can register as pain between your shoulder blades or along one side of the mid-back.
- Gallbladder: Gallstones commonly refer pain to the right side of the mid-back and the area between the shoulder blades, often accompanied by nausea or pain after eating fatty foods.
- Pancreas: Pancreatitis can produce deep, boring pain that radiates straight through to the middle back. It often worsens after eating and may come with nausea or vomiting.
- Heart: A heart attack can cause pain in the upper or middle back, particularly between the shoulder blades, along with shortness of breath, dizziness, or chest pressure. This combination warrants emergency attention.
- Kidneys: Kidney infections or stones typically cause pain on one side of the mid-to-lower back, often with fever, painful urination, or blood in the urine.
The key distinction is that referred pain from organs usually doesn’t change when you shift position, stretch, or press on the area. Musculoskeletal pain almost always does.
T4 Syndrome and Nerve-Related Pain
T4 syndrome is a poorly understood condition linked to dysfunction in the upper thoracic joints, roughly at the level of the fourth thoracic vertebra. It produces local pain between the shoulder blades along with unusual symptoms: numbness or tingling in one or both arms and hands, headaches, and sometimes changes in skin temperature or sweating patterns in the hands. These extra symptoms are thought to come from irritation of the sympathetic nerves that run alongside the upper thoracic spine.
There are currently no established diagnostic criteria or specific tests for T4 syndrome, which makes it a diagnosis of exclusion. It’s typically considered after more common causes have been ruled out and neurological exams come back normal. The condition often responds well to manual therapy targeting thoracic joint mobility.
How Mid-Back Pain Is Diagnosed
A physical exam is usually the starting point. Your provider will check your range of motion, press along the spine and surrounding muscles to locate tenderness, and test your reflexes and sensation to rule out nerve involvement. For many cases of muscle strain or postural pain, no imaging is needed.
When imaging is warranted, the choice depends on what’s suspected. X-rays are the first step for identifying fractures, misalignments, and narrowed joint spaces, but they can miss subtle bone injuries and won’t show soft tissue problems. MRI provides excellent detail of both bones and soft tissues, making it the preferred tool for suspected nerve compression, disc problems, or spinal injuries. CT scans are typically reserved for trauma situations where fractures need to be evaluated quickly and in fine detail.
Ergonomic Changes That Protect the Thoracic Spine
Since postural strain is the most common driver of mid-back pain, adjusting your workspace can make a meaningful difference. Place your monitor directly in front of you, about an arm’s length away (20 to 40 inches from your face), with the top of the screen at or just below eye level. If you wear bifocals, lower the monitor an additional 1 to 2 inches. Choose a chair that supports the natural curves of your spine. Your feet should rest flat on the floor, with your thighs parallel to the ground. If your chair has armrests, set them so your elbows stay close to your body and your shoulders can relax rather than shrug upward.
Beyond the setup itself, movement matters. No ergonomic arrangement eliminates the stress of sustained postures. Getting up every 30 to 60 minutes to move, stretch your chest and upper back, or simply change position interrupts the cycle of tissue loading that leads to pain. Strengthening the muscles between your shoulder blades with rows, band pull-aparts, or similar exercises builds the endurance those tissues need to hold you upright without complaint.