Circulation to the lower leg can also be compromised if the chair is too high. Check the length of the seat pan There should be 2-3 inches between the back of your leg and the seat of the chair. This will allow for a natural bend in your knees. If the seat pan is too short, it can create pressure points and discomfort in the back of the thigh. If the seat pan is too long, you will not be able to sit back in the chair.
Some chairs have adjustments that shorten or lengthen the seat pan if necessary.
Lumbar pillows can also be used as a method to improve the fit of a seat pan that is too long. If your chair has seat pan and backrest angle adjustment, adjust the angle of each to support your work activities. The chair should support an upright position for keyboard activities. If your chair rocks or reclines, consider adjusting the tension to support upright postures for computer and desktop activities. Adjust the lumbar support The curve of the backrest should support the natural curve of your back.