Upper back pain at a desk is commonEmerging evidence
Across 33 studies, between 3.5% and 34.8% of people had upper (thoracic) back pain over a year, more often women and young people. In working adults, a review of 52 studies found most occupational groups around 30%, and linked it with other muscle and joint pain, being female, a high workload, problems with the workstation, boring tasks and high mental pressure.
In a survey of 1,185 office workers, 28% had had upper back symptoms over a year, more often women and people under 30. These studies show links, not causes.
Sources 1, 2, 3
Usually tired muscles, and a long, still dayEmerging evidence
The muscles that hold the shoulder blades and upper back, such as the trapezius and rhomboids, work steadily while you sit at a keyboard. In office workers followed over time, low variety in the work, a keyboard too close to the body, low satisfaction with the workplace and feeling tense went with new neck pain; in women with long-lasting trapezius pain from monotonous computer work, strengthening those muscles eased the pain a lot. That fits tired, overworked muscles rather than damage, though the trials are of neck and shoulder pain rather than upper back pain alone.
Sources 4, 5
Posture matters less than you've been toldEmerging evidence
In 686 young people followed from 17 to 22, sitting posture didn't predict neck pain in men, and the women who sat upright had more neck pain, not less. A review of 41 reviews found no agreement that posture or sitting causes low back pain, physiotherapists favour upright sitting "despite a lack of strong evidence that any specific posture is linked to better health outcomes", and specialists have called the advice to sit up straight a belief that needs re-evaluating.
Most of this evidence is about the neck and low back; no study has tested a sitting posture for upper back pain. NHS inform's advice for back pain is that "your posture doesn't need to be perfect", and to move often so you don't stay in the same position for too long.
Sources 6, 7, 8, 9, 10
The small joints of the upper backEmerging evidence
In a US pain practice, 42% of people with long-lasting upper back pain had pain from the small (facet) joints of the spine, confirmed with two numbing injections; with one injection, more than half of the positive results were false alarms. That was a selected group with long-standing pain, so it doesn't tell you how common joint pain is in desk workers, and no study of the rib joints in desk workers was found.
Source 11
Know the look-alikesStrong evidence
The NHS says call 999 for chest pain that spreads to your arm, neck, jaw, stomach or back, or chest pain with sweating, feeling sick, light-headedness or breathlessness; for difficulty breathing that comes on suddenly, or "pain in your chest or upper back" with a very fast heartbeat (a possible clot in the lungs); and for a sudden chest or back pain that feels like something being torn inside.
Shingles can start as tingling or pain in one area of skin before a one-sided rash appears, and rarely causes pain without a rash. Gallstone pain spreading from the tummy to the back with vomiting is a 999 call. Osteoporosis can cause spinal fractures and a stooped posture, and kyphosis, a rounded upper back, may cause back pain and stiffness.
Sources 12, 13, 14, 15, 16, 17, 18, 19, 20
When a scan or test helpsStrong evidence
Not for an ache at a desk that changes with movement and position. The NHS asks you to see a GP for back pain "coming from the top of your back (between your shoulders)", and the GP decides whether you need tests. Numbing injections into the facet joints are a pain clinic test for a selected few. Chest pain and sudden breathlessness are emergencies, not scan questions.
Sources 21, 11, 12
How it usually goesEmerging evidence
The Chartered Society of Physiotherapy (CSP) says most muscle and joint problems get better within 6 to 8 weeks. No study has followed desk-related upper back pain on its own, so we can't give a figure; in the strength trials, neck and shoulder pain eased over 10 weeks. No one can promise a date.
Sources 22, 5, 23