[header] How to prevent and manage sciatic pain [title] Stand up straight with your ears aligned with your shoulders. [step] Sitting puts extra stress on your lower back. Sit with your knees slightly elevated to reduce pressure on your spine. 
Make sure your back and buttocks sit against the back of the chair. It is a good idea to keep the spine moving throughout the day to prevent stiffness in the vertebrates involved with sciatica (l4-s4).