Other causes of nausea include side effects from medications, pain, pregnancy and morning sickness, seasickness, viral infection, alcohol toxicity, and disease of the brain, esophagus, stomach, gallbladder, liver, pancreas, and intestine.
so roosevelt was able to win more than two terms because there was not yet a formal term limit on the presidency and the unique conditions when he ran for his third and fourth terms made his arguments for breaking with tradition acceptable to a majority of american voters
At the time, an amendment limiting presidents to two terms in office seemed an effective way to invalidate Roosevelt's legacy, to discredit this most progressive of presidents. In the House, one of the few Northern Democrats to vote with the majority was freshman representative John F. Kennedy, whose father had fallen out with Roosevelt.