Whats Causing the Pain in My Upper Back on the Left Side, and How Do I Treat It? Upper left back pain is sometimes caused by the spine or back muscles. In other cases, the pain may be unrelated to your back. Organs like the kidneys or pancreas can cause pain that spreads to your upper back.
Why does the middle left side of my back hurt?
Middle back pain causes include sports injuries, poor posture, arthritis, muscle strain, and car accident injuries. Middle back pain is not as common as lower back pain because the thoracic spine does not move as much as the spine in the lower back and neck.
What side is your sciatic nerve on?
The five nerve roots come together to form a right and left sciatic nerve. On each side of your body, one sciatic nerve runs through your hips, buttocks and down a leg, ending just below the knee. The sciatic nerve then branches into other nerves, which continue down your leg and into your foot and toes.