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
While elected to twice as many terms as any other, his death in 1945 came early in his fourth term. The Twentieth Amendment shortened Roosevelt's first term by six weeks and limited his time in office to 12 years and 83 days, much less than the 16 years to which he was actually elected. Near the end of the 1944 campaign, Thomas Dewey announced support of an amendment that would limit future presidents to two terms.