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 last President to serve more than two terms was Franklin D. Roosevelt. Roosevelt served three full terms as President and was elected to a fourth term. Roosevelt died 83 days into his fourth term in office. Congress passed the Twenty-second Amendment on March 21, 1947. The required number of states ratified it in 1951.