To try to prevent back pain and sciatica, you should take good care of your body and practice healthy habits. You should:

• Sit and stand properly. Don't sit cross-legged because that puts pressure on your sciatic nerve.
• Learn to lift correctly.
• Exercise regularly. (Low-impact aerobic exercise is especially good.)
• Attain and maintain a healthy body weight.
• Eat healthy foods (a well-balanced, low-fat diet rich in fruits and vegetables).
• Select a mattress and box spring that offers good support. Slip a pillow under your knees to help relieve low back pressure. People who prefer to sleep on their side should place a pillow between their knees to help reduce hip and low back pain.
• Stop smoking.
• Avoid excessive use of alcohol.
• Get plenty of rest.