The symptoms of food poisoning usually begin within one to two days after eating contaminated food, although they may start at any point between a few hours and several weeks later.
Mae symptomau gwenwyn bwyd fel arfer yn dechrau o fewn diwrnod neu ddau ar ôl bwyta bwyd wedi ei halogi, er y gallant ddechrau ar unrhyw adeg rhwng ychydig oriau a nifer o wythnosau’n ddiweddarach.