Above all else, sciatica is caused when the nerve roots at the top of the sciatica nerve become compressed. When pressure occurs on these nerves during pregnancy, you can experience that shooting and numbing pain typical of sciatica. Improving the health of your nerves before you become pregnant is therefore a preventative step your can take against sciatica. Omega-3, fatty acids commonly found in fish oils, offers you a natural way to do just that. So, what exactly is the connection between sciatica and omega 3?