people with tn very seldom get pain on both sides at exactly the same time,,thats because one side of brain has lots of amonia like receptors,and the other side has few,,the amonnia uptake is less,,,a nerve iritant explains every thing,,thank god some doctors are now saying tn is diet related,,of course it is,,,only changed brain chemistry would explain nerves misfiring,,,i for one dont need any convincing,,my tn has allmost gone,,thats the proof,,,,,one cause one cure