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The most common cause of true sciatica is a "slipped disc". The discs (or inter-vertebral discs) are the cushions which separate the bones of the spine (vertebrae).
Treatment of ongoing back problems must be directed at the cause. This may mean losing weight (because being overweight can make back pain worse), getting your muscles in better shape, and improving your posture when you're sitting, standing and sleeping.
It is commonly known that back pain sufferers should be encouraged to sleep in the semi foetal position with a cushion between their knees.