If desk work leaves your shoulders feeling tense, check what happens when you reach for the mouse, rest your forearms and take a call. A mouse can be beside the keyboard yet still too far sideways. An armrest can support your arm yet stop the chair moving close enough. Identify the particular task that changes your position, then adjust that part of the setup.
This guide helps you investigate those everyday mismatches. It cannot diagnose shoulder pain or promise that a desk adjustment will resolve it. For the whole workstation, start with our seven-point desk ergonomics checklist; here, the focus is the reach between you and the work.
Watch the task that changes your shoulder position
Look at a normal piece of work, rather than arranging yourself for a posture photograph. Compare typing a sentence, selecting something with the mouse and answering a call. Notice when an elbow moves away from your side, a shoulder lifts, or you leave the backrest to reach an object.
Make the observation specific: “I lean forward to use the mouse on the upper desk” is more useful than “my posture is bad.” Do not repeatedly perform a movement that hurts to investigate it. The purpose is to identify an arrangement you can change, not test how much discomfort you can tolerate.
The mouse is close to the keyboard, but far from you
Look at the keyboard's full width. A built-in number pad may put the mouse a long way from the letter keys you use most. CCOHS explains this reach problem: the extra keys can prevent a mouse from sitting more directly in line with the arm and shoulder. A shorter keyboard can create space, but its layout also takes getting used to.
Before buying anything, clear the mouse's working area and check how you sit relative to both devices. If you rarely enter numbers, a compact keyboard with a separate number pad may be worth trying. If number entry is central to your work, explain that to the person assessing the setup; removing useful keys could create a different problem.
The keyboard tray has no room for the mouse
A mouse left on the higher desktop while the keyboard sits below asks the arm to work at another height. OSHA's pointing-device guidance suggests options such as a surface large enough for both devices or an appropriate adjacent mouse tray. Assess the complete arrangement before adding an accessory. Avoid balancing the mouse on an unstable improvised shelf.
The mouse starts close, then keeps drifting away
Check what pushes it outward: papers occupying the working area, a caught cable, or pointer movement that requires repeated large sweeps. Review speed and sensitivity in your computer's settings. OSHA recommends a setting you can control with a light touch; excessively fast and excessively slow settings can both create difficulties.
Try a small adjustment with an ordinary task, such as selecting text. Keep the previous setting in mind so you can undo an unhelpful change. The aim is comfortable control, not the highest sensitivity number. Familiar keyboard shortcuts can also reduce repeated mouse actions.
The armrests help until you approach the desk
Check two things separately: where the armrests meet your forearms, and whether they allow the chair to approach the work. A comfortable height in the middle of the room may be impractical under a low desktop.
OSHA's chair guidance describes several distinct problems. High armrests can keep shoulders raised; low ones can encourage leaning sideways. Widely spaced supports may make you reach outward, while large or poorly positioned armrests can keep the chair too far from the keyboard.
Use the chair's approved adjustments to find light, comfortable forearm support with your upper arms near your torso. Then check the approach to the desk again. Do not lift your shoulders to meet the pads or perch forward to get around them. If the available adjustments cannot accommodate both you and the desk, ask for a workstation assessment. A different armrest arrangement may be needed; do not dismantle an unfamiliar chair without its instructions.
The phone call changes the setup
A desk can work for typing and fail as soon as a call arrives. Notice whether the phone sits behind the monitor, whether you hold it between your head and shoulder to write, or whether a short cable pulls you out of your settled position.
OSHA recommends keeping the telephone within easy reach and using a headset or speakerphone for longer conversations. If you need both hands for notes, choose a permitted hands-free arrangement before the call. A headset needs a comfortable fit; speakerphone use depends on privacy and the people sharing the room.
Test the actual call workflow, including where you write notes and how you mute. Otherwise, moving the phone may simply transfer the repeated reach to a notebook or control.
Check whether the change survives real work
Choose one clear observation and its corresponding adjustment. After the next ordinary task, ask whether the reach actually changed and whether something else became awkward. This is a practical review, not a clinical experiment: a comfortable few minutes cannot establish the cause of symptoms or prove a lasting benefit.
The HSE's assessment guidance considers the job, the whole workstation and the worker's individual requirements together. It also calls for attention when people report discomfort. If you keep cycling between two unsatisfactory arrangements, bring a specific example to your workplace assessor instead of continuing to compensate.
Also release the mouse when you are not using it. The HSE workstation checklist explicitly includes this habit alongside relaxed arm positioning and suitable support. An improved reach still needs changes of activity; our meeting-day screen-break guide covers how to make room for them.
Keep the after-work choice separate
When work is finished, an optional stationary comfort pause is a different decision. ThermoLuma Shoulder Wrap uses a shaped panel and adjustable cross-body strap, with heat and massage-like vibration. Those features do not adjust your workstation or establish treatment for desk-related symptoms.
If you choose to use it, follow the supplied instructions, the Shoulder Wrap fit guide and Product Safety guidance. A wind-down should not become a reason to postpone an unresolved workplace or health concern.
Common shoulder-and-desk questions
Do I need a vertical mouse?
No particular shape is a universal answer. A new mouse still needs reachable placement and comfortable control. Try alternatives with your actual tasks where possible, rather than choosing a device solely because it is labelled ergonomic.
Should my shoulders stay completely still?
No. The aim is to avoid a setup that repeatedly makes you reach or hold an awkward position, not to freeze yourself into one pose. Leave room for ordinary movement and changes of task.
When should I seek medical advice instead?
Seek advice for worsening shoulder pain, difficulty moving the arm, or symptoms that do not improve. NHS guidance advises urgent help for sudden or severe pain, inability to move the arm, marked swelling or changed shape, persistent pins and needles, loss of feeling, or pain after an injury. Use appropriate local care; do not assume the desk explains every symptom.
Official guidance and current ThermoLuma information checked September 20, 2026. These are practical workstation observations, not a diagnosis, a tested ThermoLuma ergonomics programme or a promise of symptom relief. Images illustrate generic workspace arrangements, not prescribed measurements or individual fit.