Why do my forearms ache from typing?

The anatomy, simply

The forearm flexors run along the palm side from the inner elbow to the fingers; the extensors run along the back from the outer elbow. Both cross the elbow and the wrist, so both areas feel the tension.

Why it happens

The arm is one continuous line from the chest to the fingertips. Working only at the wrist keeps you at the far end of it.

What to try today

Chest and front of shoulder first, then forearm flexors, then extensors, each with active hand opening and closing.

Low effort, long duration

Typing is not heavy work, but it is constant. The muscles that curl your fingers stay lightly on for hours at a time.

Tissue that never fully lengthens or fully rests is exactly the tissue that gets dense and achy.

Start at the chest, not the wrist

Reaching forward all day shortens the chest and the front of the shoulder, which changes how the whole arm hangs and loads.

Opening the chest first makes the forearm work land better. In practice, that order changes how quickly people get relief.

Work both sides of the forearm

Most people only ever work the palm side. The extensors on the back of the forearm are usually just as involved, especially with mouse use.

Pin a point, then slowly open and close your hand and turn your palm up and down. That active movement is what makes it work.

Change the setup

Keep your elbows near your sides, wrists straight rather than bent up, and the mouse close.

Every hour, hang your arm by your side and slowly open and close the hand twenty times. It takes fifteen seconds and it interrupts the pattern.