· Upper left back pain can occur due to injuries, posture, or an underlying health condition. Learn about causes, treatments, and prevention tips here. · Read on to learn about the possible causes of upper leftbackpain, including accompanying symptoms, treatments, and when you should visit a doctor. Learn about upper backpain on the left side, including its common causes and treatment options. Muscle strain is a frequent cause of upper leftbackpain, often from overexertion, sudden movements, or repetitive activities. Muscles like the rhomboids and trapezius, located around the shoulder blades, are particularly susceptible. · Identify what causes upper leftbackpain, from muscle strain to health conditions. Gain valuable insights for better understanding and relief strategies. Read more! · Upper leftbackpain can show up as a dull ache, a burning pull, or a sharp stab near your left shoulder blade or rib area. This pain might be mild for some people and severe for others. The cause can range from something simple, like bad posture, to something serious, like heart or kidney problems. What Is Upper Left Back Pain? Upper backpain can occur anywhere between the base of the neck and the bottom of the rib cage. Upper backpain may be caused by injuries or fractures, poor posture, disk problems or other issues, such as arthritis.