Because your neck has spent the day holding your head in one position. Sitting at a desk is not damaging. What your neck objects to is doing the same small job for hours without a break. That is why the ache tends to build after lunch and peak on the walk to the train.
Your head is heavier than it feels
An adult head weighs roughly five kilograms, near enough to a bowling ball. When it sits balanced over your shoulders, the bones of your neck carry most of that weight and the muscles barely have to work.
Move the head forward towards a screen and the arrangement changes. Now the muscles at the back of your neck and between your shoulder blades have to hold it there, like holding a weight out in front of you instead of against your chest. The further forward it drifts, the harder they work. Do that for eight hours and those muscles get tired, tight and sore, exactly the way any muscle does when you ask it to hold something for too long.
“Tech neck” is a habit, not a diagnosis
Tech neck is the name people give to the shape we fall into over a laptop or a phone: head forward, chin poking, shoulders rounded, upper back slumped. Screens sit lower than eye level, and we follow them down.
It is worth being clear about what it is not. It is not a disease, it is not permanent damage, and a photo of your posture is not a prognosis. It is a loading pattern, a description of where the strain is going. Change the pattern and the strain moves with it.
It is the staying still that hurts, more than the sitting
There is no single posture that is bad for you, and no single posture that is safe. Joints do well on movement; muscles fatigue when they are held. Two hours without shifting will make almost any position uncomfortable, including a textbook-perfect one.
This is why we tell people the best posture is the next one. If you take nothing else from this article, take that.
What actually helps at work
- Lift the screen. The top of the monitor should sit at about eye height. On a laptop that means a riser or a stack of books, plus a separate keyboard and mouse. A laptop on its own cannot put the screen and the keyboard where they both need to be.
- Bring the phone up to you. Raise the phone towards your eyes instead of dropping your head towards the phone.
- Move roughly every half hour. A minute is enough. Stand, roll the shoulders, turn the head both ways, look out a window. The break matters more than the exercise.
- Set the chair up once, properly. Feet flat on the floor, forearms level with the desk, back supported.
- Use a sit-stand desk for the change, not the standing. Standing all day causes its own aches. Alternating is the point.
- Build some strength. Stronger upper-back and neck muscles tolerate more hours before they complain. A few simple exercises done regularly will do more than any gadget.
If your neck is already sore every day, setting up the desk properly is often not enough on its own. Joints that have been stiff for months and muscles that have been guarding need settling too, and the habits need coaching alongside the hands-on work. That is what posture and structural correction is for. If the neck pain arrives with headaches, it is also worth reading can a headache really start in your neck?
When to get it looked at
Some things should be checked before anyone treats your neck.
Go to a hospital emergency department if you have neck pain after a car accident or a heavy fall, a headache that comes on suddenly and severely, a headache with fever and a stiff neck, or any confusion, slurred speech, facial drooping, weakness or loss of vision.
See your GP promptly if you have pins and needles, numbness or weakness in an arm or hand, if you are dropping things or feeling clumsy, or if neck pain comes with unexplained weight loss or night pain that wakes you.
Otherwise, the ordinary threshold for booking an assessment is this: your neck has not settled after a couple of weeks, the same pain keeps coming back every week, or it is bringing headaches with it. We will work out what is actually loaded, treat it, and show you what to change so the working day stops costing you your evenings. Individual responses vary, and outcomes cannot be guaranteed.