Your chair is too high.
If your chair is high enough that your feet are dangling, you may experience foot or knee pain. Make sure you use a footrest to support your feet. See Chair Setup and Usage.
Your seat pan is too deep.
This can cause pressure on the back of your knees. Tilting the seat back slightly forward or using a back pillow may help you obtain a more comfortable position. Some newer ergonomic chairs also feature a "waterfall" edge which helps prevent your knees from "catching" on the seat pan, or a sliding seat pan that adjusts for depth. See Chair Setup and Usage.
Your chair is too low.
Remember that raising your chair may require raising your keyboard and monitor if they're already properly adjusted. See Chair Setup and Usage. You've been sitting too long without a break. Standing, walking around, or even just swinging your legs back and forth a bit can help exercise your muscles and restore good circulation. You may also want to consider stretching during the break to relax your muscles and improve circulation. See Stretches and Exercises.
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