Would be wrong for anyone to try and give you an answer / diagnosis using this forum alone. Best to go and see your GP.. .. .Chest infections can result in white phlegm being coughed up, but solid white chunks???. .. .It would be difficult for anything to be returned from the lungs by breathing and not coughing or the stomach without vomiting.. .. .Try and take a sample of the stuff with you when you see the GP.. .. .Sorry I can't be of any more help. Any other medics have an idea?