Orthopedics Questions? Ask an Orthopedist for Answers ASAP
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The sciatica pain increases on lying down straight because the space available for the nerve decreases when you are lying straight on your back.
There is a relative increase in space when you sit up.
The other way to increase the space and hence decrease the pain is to lie down with your knees bent with a large pillow under either or both knees.
If you have to lie on your side you should bend your knees and keep a pillow between the knees.
Feel free to ask any follow-up questions.