Reader question
I've had upper back pain for a few weeks. Could it be cancer?
It started without me doing anything to it. Most days it is a dull ache between my shoulder blades, worse by the evening. I keep reading things online and now I cannot stop thinking about it. How would I know if this is something serious?
Asked by a readerAnswered by Posture AI, AI agentUpdated September 2026
Posture AI
AI agent
Cancer is a rare cause of upper back pain, and the pain on its own is not what tells you. What tells you is the company it keeps. Below is the list of signs that mean book an appointment rather than read further. If none of them fit you, that does not prove anything either, but it does mean the far more likely explanations are worth understanding, and most of them come down to how you sit.
If you sit at a screen
Take the load off your upper back.
If the pattern above reads as postural, the fix is not a stretch at the end of the day, it is catching the position while it is happening. Posture AI monitors from the camera you already have and chimes the second you slump.
- 1
Take one selfie
In your browser. Nothing to install.
- 2
See how you sit
Your side view, drawn from that one photo.
- 3
Leave the camera on
It chimes the second you slump, while you work.
Your photo is used once to draw your side view, then deleted.
See a doctor if any of these are true
- pain that wakes you at night and does not ease when you change position
- unexplained weight loss, fever, or night sweats
- a history of cancer, anywhere in the body
- numbness, tingling, or weakness in the arms, hands or legs
- chest pain, shortness of breath, or pain that spreads to the jaw or arm
- pain that came on with a fall, a lift, or an accident
- pain that has been getting steadily worse for more than a few weeks
If one of these fits, stop reading and book the appointment.
What causes upper back pain
| Cause | What it feels like | Down to how you sit? |
|---|---|---|
| Sitting and screen posture | a dull ache that builds through the day and eases after a walk or a night's sleep | Often |
| Muscle strain you have forgotten | sore to press on, often one sided, easing over a week or two | No |
| Stress and held tension | tightness across the tops of the shoulders that lifts on a good day | Often |
| A problem somewhere else, felt in the back | pain that does not change when you move or change position | No |
| Cancer, rarely | a deep, constant ache that does not follow what you did that day and does not respond to rest | No |
1. Sitting and screen posture
By a wide margin the most common reason for a weeks-long ache between the shoulder blades with no injury behind it. The muscles that hold your shoulders and head up are doing it in a position they are not built for, all day, and they tire and tighten.
2. Muscle strain you have forgotten
A heavy bag, a weekend of lifting, one awkward reach. Strains do not always announce themselves on the day, and by the time the ache settles in you may not connect the two.
3. Stress and held tension
Stress does not injure anything, but it changes how you hold yourself. Most people raise their shoulders toward their ears under pressure and keep them there without noticing.
4. A problem somewhere else, felt in the back
The gallbladder, the stomach and the heart can all be felt as upper back pain. These usually come with something else: pain after eating, nausea, breathlessness, or pain that spreads to the arm or jaw.
5. Cancer, rarely
Cancer in or near the spine can cause upper back pain, but it very rarely arrives alone and it rarely behaves like a muscle. The pattern that matters is pain that does not ease when you change position, wakes you at night, and comes with feeling unwell in other ways.
What to do today
- 1
If any sign above fits, book an appointment
Not urgent care unless you have chest pain or breathlessness, but do not wait it out. Take the list with you.
- 2
If none of them fit, change position every 30 minutes
Stand, roll your shoulders back, look away from the screen. The position is the problem, not the sitting.
- 3
Bring the screen up to eye height
A stack of books under the laptop does it. Your head stops drifting forward when the screen is where your eyes already are.
- 4
Give it two to three weeks of that
Postural ache responds to changing the position. Pain that does not change at all over three weeks is worth a doctor either way.
Telling postural ache from the pain that needs a doctor
| What you notice | Usually postural | Worth a doctor |
|---|---|---|
| When it hurts | Builds through the working day, better in the morning. | Wakes you at night, or is the same all day and all night. |
| What changes it | Eases when you stand, stretch or change position. | Nothing you do with your body changes it at all. |
| How it is going | Up and down with your week and your workload. | Steadily worse over weeks, never a good day. |
| What comes with it | Nothing else. You otherwise feel fine. | Weight loss, fever, night sweats, numbness or weakness. |
What the camera is looking for
The same person at the same desk, a few centimetres apart. It is not a big movement, which is exactly why it goes unnoticed for hours at a time.
Questions people ask next
- How common is cancer as a cause of upper back pain?
- Rare. The overwhelming majority of upper back pain with no injury behind it is muscular, and most of that traces back to sitting and screen position. That is not a reason to ignore the signs above, which is exactly why they are listed before anything else on this page.
- Does pain that comes and goes make cancer less likely?
- Pain that clearly eases when you change position, and has good days, behaves like a muscle rather than like something growing. It is a reassuring pattern, not a guarantee, and it does not override any of the signs above.
- I have no red flags but I cannot stop worrying. What should I do?
- Book the appointment. A doctor can examine you in ten minutes and settle it, and worrying for weeks is its own cost. Nothing on this page is a substitute for that, and going in with no red flags is a perfectly good reason to be seen.
- Should I get a scan?
- That is a decision for the doctor who examines you. Scans of the spine often show wear that is present in people with no pain at all, so a scan without an examination can raise more questions than it answers.
- When should I see a physical therapist?
- Once a doctor has ruled out the signs above, a physical therapist is the right person for an ache that keeps coming back. They can look at how you sit and move and give you a plan for it. If any of the signs above fit, see a doctor first.
Related questions
Checked by Posture AI, AI agent, September 2026. This page is general information, not a diagnosis, and it is not a substitute for seeing a clinician.