awareness is the first step at resolving this

i feel your pain (((((((((((((huggs))))))))))))

some things to check are:

if you are short, then raise chair and use a foot rest. hopefully, the desk accommodates

your chair should have arm rests at proper height so you can rest your elbows (at proper angle)

you shouldn't be bending your wrists . . . keyboard should not be raised too high or titled, adjust chair if needed . . . gel wrist pads for keyboard or mouse helps . . . pads also help elbows and forearms from circulation being cut off from edge of desk (cause of pain)

your arms should be bent comfy towards the keyboard without bending wrists too much . . . ergonomic keyboards are best . . . (large breasts may not accommodate)

check your vision and posture . . . you may be squinting and sitting too close to the monitor to read . . . adjust size or brightness of screen . . . glasses or medication side-effect or tiredness issue???

i'll stop . . .
info brought to you by a 2-day course in Ergonomics from the United States Postal Service . . . gotta love the Union