Upper left back pain is most often caused by a strained or overworked muscle, and in most cases it responds well to a combination of rest, temperature therapy, and targeted stretching. The majority of back strains resolve within about two weeks with consistent self-care. That said, pain in this specific area can occasionally signal something beyond a muscle issue, so knowing what to watch for matters just as much as knowing how to find relief.
What Typically Causes Upper Left Back Pain
The upper left back is home to several muscles that connect your shoulder blade to your spine, including the rhomboid and the levator scapulae. These muscles are responsible for pulling your shoulder blade toward your spine and lifting it when you shrug. They’re also among the first to tighten up when you spend hours hunched over a screen, sleep in an awkward position, or suddenly lift something heavy. A strain in one of these muscles produces a dull ache or sharp pull between the shoulder blade and spine, often on just one side.
Trigger points, which are stiff, knotted spots within the muscle tissue, are another common culprit. They develop when a muscle stays contracted for too long and can refer pain across a surprisingly wide area of the upper back. Thoracic facet joints, the small joints linking each vertebra in your mid-spine, can also become irritated from repetitive twisting or poor posture and send localized pain to one side.
Ice First, Then Heat
For the first 72 hours after the pain starts, apply ice to the upper left back for 15 to 20 minutes at a time, with at least an hour between sessions. Ice reduces inflammation and numbs the area, which is most helpful while the tissue is still freshly irritated. After 72 hours, switch to heat. A heating pad or warm towel helps loosen tight muscle fibers, increase blood flow, and restore flexibility. Many people find alternating between the two after the initial three days provides the most relief.
Stretches That Target the Right Muscles
Stretching the muscles around your left shoulder blade can relieve tension quickly, especially when combined with heat.
- Levator scapulae stretch: Sit upright and turn your head about 45 degrees to the right. Gently tuck your chin toward your right collarbone until you feel a stretch along the left side of your neck and upper back. Hold for 20 to 30 seconds.
- Cross-body shoulder stretch: Bring your left arm across your chest at shoulder height and use your right hand to press it gently closer to your body. You should feel this through the back of your left shoulder and between your shoulder blades.
- Thoracic rotation stretch: Sit in a chair with your feet flat on the floor. Place your hands behind your head and slowly rotate your upper body to the right, keeping your hips facing forward. Hold for 15 to 20 seconds, then repeat to the left. This mobilizes the small joints along the mid-spine.
- Cat-cow: On your hands and knees, alternate between arching your back toward the ceiling (cat) and letting your belly drop toward the floor (cow). Move slowly through 10 repetitions. This gently mobilizes the entire thoracic spine.
Perform these stretches two to three times a day. They should produce a comfortable pulling sensation, not sharp pain. If any stretch makes the pain worse, stop.
Over-the-Counter Pain Relief
Anti-inflammatory medications like ibuprofen or naproxen are generally the better choice over acetaminophen for musculoskeletal back pain. Current clinical guidelines from the VA and Department of Defense recommend anti-inflammatories for back pain and actually suggest against using acetaminophen alone, as it has shown limited benefit for this type of pain. Take anti-inflammatories with food and use the lowest effective dose for the shortest time needed.
Hands-On Therapy
If self-care isn’t enough after a week or so, professional treatment can help. During myofascial release therapy, a therapist uses their hands to locate stiff areas in the muscle tissue and applies sustained, light pressure to release them. Research has found that massage and spinal manipulation work as well as other treatments for back pain, though the techniques vary between practitioners, so results can differ. Dry needling, where a thin needle is inserted into a trigger point to release the knot, is another option that some physical therapists offer for stubborn upper back tension.
Fixing the Posture That Caused It
If your upper left back pain keeps coming back, your daily posture is likely a factor. A few adjustments to your workspace can break the cycle:
- Monitor height: The top of your screen should sit at approximately eye level so you’re not tilting your head up or bending your neck down. If you use a laptop, a separate keyboard and a laptop stand make a significant difference.
- Chair positioning: Sit all the way back in your seat so your back is touching the chair’s backrest. Your spine should maintain its natural S-curve, which prevents the rounded-shoulder posture that overloads the muscles between your shoulder blades.
- Arm symmetry: If you consistently mouse with one hand, carry a bag on one shoulder, or cradle a phone against one ear, you’re loading one side of your upper back more than the other. Switching sides regularly or using a headset can prevent one-sided strain from building up.
Take a 30-second movement break every 30 to 45 minutes. Stand, roll your shoulders backward five times, and do a quick chest-opening stretch. This alone can prevent the muscle fatigue that leads to trigger points.
When Upper Left Back Pain Isn’t Muscular
Pain in the upper left back can occasionally come from internal organs rather than muscles. This is called referred pain, and it happens because organs and nearby muscles share nerve pathways, so the brain misreads where the signal is coming from.
The heart is the most important one to know about. A heart attack can produce pain between the shoulder blades, particularly on the left side, along with chest tightness, shortness of breath, or dizziness. A sudden, sharp pain between the shoulder blades can also signal a ruptured spleen, known as Kehr’s sign. Pancreatitis sometimes refers pain to the upper back as well. In rare cases, sudden severe back pain can indicate a ruptured aortic aneurysm or aortic dissection, both of which are life-threatening emergencies requiring immediate care.
Seek emergency care if your upper left back pain comes with any of the following: chest pain or pressure, difficulty breathing, dizziness, sudden leg weakness, loss of bladder or bowel control, or numbness in the groin area. If the pain is sharp rather than a dull ache and arrived without any clear physical trigger like lifting or twisting, that also warrants prompt evaluation.
Typical Recovery Timeline
Most upper back strains improve substantially within two weeks with consistent self-care. Mild cases, where the pain is more of an annoying tightness than a sharp catch, often resolve in three to five days with stretching and ice-to-heat therapy. Moderate strains that hurt with certain movements typically take one to two weeks. If you’re still experiencing significant pain after two weeks of home treatment, additional care such as physical therapy or imaging may be needed to rule out joint dysfunction, a disc issue, or another structural cause.