Mid back pain is usually caused by muscle strain, poor posture, or joint stiffness in the thoracic spine, the 12 vertebrae between your neck and lower back. It’s less common than neck or lower back pain, but not rare: studies estimate that 15% to 35% of adults experience thoracic spine pain in any given year. Most cases resolve on their own or with simple changes, but mid back pain deserves attention because it can occasionally signal something more serious than a sore muscle.
The Most Common Causes
The thoracic spine is surrounded by muscles, ligaments, ribs, and discs that can all become sources of pain. The most frequent culprits are straightforward mechanical problems: muscle strains from overuse or awkward movements, ligament sprains, and gradual wear on the soft tissue around the spine. These tend to cause a dull ache or stiffness that worsens with certain positions or activities.
An imbalance between the muscles that support the spine is another common driver. When the muscles across your chest and the tops of your shoulders become tight while the muscles between your shoulder blades grow weak, your upper back rounds forward. This pattern creates focal stress at specific points in the mid back, particularly around the T4 and T5 vertebrae, a transitional zone where the shape of the vertebrae changes. The result is a persistent ache between the shoulder blades that gets worse as the day goes on, especially if you sit at a desk.
Disc problems in the thoracic spine are possible but uncommon. Thoracic disc herniations account for less than 1% of all herniated discs. When they do occur, they can cause upper back pain along with numbness or tingling that wraps around the chest, and occasionally leg weakness.
How Posture and Desk Work Contribute
Hours of sitting with a rounded upper back is one of the most reliable ways to develop mid back pain. When your head drifts forward and your shoulders roll inward, the muscles between your shoulder blades are stretched and overworked while the muscles in your chest shorten. Over weeks and months, this creates a self-reinforcing cycle of tightness and weakness that loads the thoracic spine unevenly.
If you work at a desk, a few specific adjustments can reduce the strain. Place your monitor about an arm’s length away, with the top of the screen at or slightly below eye level. If you wear bifocals, lower it an additional 1 to 2 inches. The monitor should sit directly behind your keyboard, somewhere between 20 and 40 inches from your face. Use a chair that supports the natural curve of your spine, and keep your feet flat on the floor. These aren’t dramatic changes, but they prevent the slow postural drift that compounds into pain over time.
When Mid Back Pain Comes From Somewhere Else
One reason mid back pain deserves careful attention is that organs in your chest and abdomen can send pain signals to this area. This is called referred pain, and it happens because your internal organs share nerve pathways with the muscles and skin of your back. The pain feels like it’s in your back, but the actual problem is elsewhere.
The gallbladder, kidneys, stomach, liver, and intestines can all produce referred pain in the back. Gallbladder problems often cause pain between the right shoulder blade and the spine. Kidney infections or stones tend to produce pain in the lower portion of the mid back, off to one side. Stomach and intestinal issues can create a more diffuse ache across the mid back.
Heart problems are another important consideration, particularly for women. The American Heart Association notes that some women experiencing a heart attack describe upper back pressure that feels like squeezing or a rope being tied around them. This type of pain, especially when it comes on suddenly alongside shortness of breath, nausea, or jaw pain, needs emergency evaluation.
Red Flags Worth Knowing
Clinicians treat thoracic spine pain with extra caution compared to neck or lower back pain. Mid back pain can be the first sign of a spinal infection, a tumor, or a significant disc problem. That doesn’t mean every ache between your shoulder blades is dangerous, but certain features should prompt you to get evaluated sooner rather than later.
Pain that wakes you up at night or is worse when you’re resting (rather than moving) is one of the more reliable warning signs. Other features that warrant attention include:
- Unexplained weight loss alongside the pain
- Fever or chills with no obvious source
- Numbness or weakness in your legs, or changes in bladder or bowel control
- Pain after a fall or injury, especially if you have osteoporosis or are over 50
- A history of cancer, even if it was treated years ago
If your mid back pain came on gradually, gets better with movement, and worsens with sitting or certain postures, it’s far more likely to be muscular or postural in nature.
Exercises That Help
The thoracic spine is designed to rotate and extend, but modern life keeps most people locked in a flexed, rounded position. Restoring that lost mobility is one of the most effective ways to reduce mid back pain. Two exercises in particular target the thoracic spine well and require no equipment.
The cat-cow stretch starts on your hands and knees. As you inhale, let your belly drop toward the floor and lift your chest (the “cow” position). As you exhale, round your back toward the ceiling, pushing your shoulder blades apart and tucking your chin (the “cat” position). Move through 10 cycles slowly, focusing on getting as much motion as possible through the middle of your back rather than just your lower back.
The open book stretch targets thoracic rotation. Lie on your left side with your knees bent and both arms extended in front of you, palms together. Slowly lift your right hand and open it like a book cover, following it with your eyes and head until your right arm rests on the other side of your body, palm up. Hold for a few breaths, then return. Repeat on the other side. This stretch directly addresses the rotational stiffness that builds up from prolonged sitting.
Strengthening the muscles between your shoulder blades is equally important. Rows, band pull-aparts, and wall slides all target the rhomboids and middle trapezius, the muscles that counteract a rounded posture. Building strength in these areas doesn’t just relieve current pain; it makes the underlying postural pattern less likely to return.
What to Expect During an Evaluation
If your mid back pain persists beyond a few weeks or has any red flag features, a clinician will typically start with a physical exam that involves pressing on the spine, testing your range of motion, and checking for neurological signs like changes in sensation or reflexes in your legs. They’ll ask about the pattern of your pain: when it started, what makes it better or worse, whether it wakes you at night, and whether you’ve noticed any other symptoms.
Imaging isn’t always necessary for mid back pain. When it is, an X-ray can reveal fractures or significant degenerative changes, while an MRI provides a detailed look at discs, nerves, and soft tissue. The decision to image depends on whether your symptoms suggest a structural problem or something that physical therapy and postural correction can address on their own. Most people with mid back pain improve significantly within 4 to 6 weeks of consistent stretching, strengthening, and ergonomic changes.