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
The only U.S. president to serve more than two terms was Franklin Delano Roosevelt, who died in 1945 during his third term. Six years later, in 1951, Congress passes the 22nd Amendment, which limits the commander-in-chief to just two terms in office.